[Android Software/Hacking General [Developers Only]] Christian Buchner:
Very useful software!

With unyaffs I was able to extract the files from the system partition of the 0818 and the 0827 images. Here are the major differences.

Changes in busybox, WLAN drivers (added RT2070), graphics drivers, framework, video codecs and more. A WMA decoder was added. And apparently they ran oprofile to do some speed profiling. ;)

Files 0818/system/app/Music.apk and 0827/system/app/Music.apk differ
Only in 0818/system/app: OfficeSuite.Viewer.apk
Only in 0827/system/app: Phone.apk
Files 0818/system/app/Settings.apk and 0827/system/app/Settings.apk differ
Only in 0827/system/app: TelephonyProvider.apk
Files 0818/system/bin/busybox and 0827/system/bin/busybox differ
Files 0818/system/bin/debuggerd and 0827/system/bin/debuggerd differ
Only in 0827/system/bin: inshal
Files 0818/system/bin/rild and 0827/system/bin/rild differ
diff -r 0818/system/build.prop 0827/system/build.prop
4,5c4,5
< ro.build.display.id=eng 2.1-update1 ERE27 eng.20100818.103031 test-keys
< ro.build.version.incremental=eng.wwang.20100818.103031
---
> ro.build.display.id=p7901a-eng 2.1-update1 ERE27 eng.wwang.20100826.112720 test-keys
> ro.build.version.incremental=eng.wwang.20100826.112720
9,10c9,10
< ro.build.date=Wed Aug 18 10:32:52 CST 2010
< ro.build.date.utc=1282098772
---
> ro.build.date=Thu Aug 26 11:28:26 CST 2010
> ro.build.date.utc=1282793306
29,30c29,30
< ro.build.description=p7901a-eng 2.1-update1 ERE27 eng.wwang.20100818.103031 test-keys
< ro.build.fingerprint=p7901a/p7901a/p7901a/:2.1-update1/ERE27/eng.wwang.20100818.103031:eng/test-keys
---
> ro.build.description=p7901a-eng 2.1-update1 ERE27 eng.wwang.20100826.112720 test-keys
> ro.build.fingerprint=p7901a/p7901a/p7901a/:2.1-update1/ERE27/eng.wwang.20100826.112720:eng/test-keys
Only in 0827/system/etc/firmware: gps
Files 0818/system/etc/NOTICE.html.gz and 0827/system/etc/NOTICE.html.gz differ
diff -r 0818/system/etc/ppp/gprs 0827/system/etc/ppp/gprs
18c18
< /dev/ttyUSB1 #Â´Â®Â¿Ãš
---
> /dev/ttyUSB0 #Â´Â®Â¿Ãš
diff -r 0818/system/etc/ppp/options 0827/system/etc/ppp/options
10c10
< /dev/ttyUSB1
---
> /dev/ttyUSB0
diff -r 0818/system/etc/ppp/peers/cdma 0827/system/etc/ppp/peers/cdma
1c1
< ttyUSB1
---
> ttyUSB0
Only in 0827/system/etc/ppp/peers: cdma_h
diff -r 0818/system/etc/pvplayer.cfg 0827/system/etc/pvplayer.cfg
5,8c5,8
< (0x1d4769f0,0xca0c,0x11dc,0x95,0xff,0x08,0x00,0x20,0x0c,0x9a,0x66),"libopencore_ffmpeglocalreg.so"#added by eric
< (0x6d3413a0,0xca0c,0x11dc,0x95,0xff,0x08,0x00,0x20,0x0c,0x9a,0x66),"libopencore_ffmpeglocalreg.so"#added by eric
< (0x1d4769f0,0xca0c,0x11dc,0x95,0xff,0x08,0x00,0x20,0x0c,0x9a,0x66),"libopencore_asflocalreg.so"
< (0x6d3413a0,0xca0c,0x11dc,0x95,0xff,0x08,0x00,0x20,0x0c,0x9a,0x66),"libopencore_asflocalreg.so"
---
> #(0x1d4769f0,0xca0c,0x11dc,0x95,0xff,0x08,0x00,0x20,0x0c,0x9a,0x66),"libopencore_ffmpeglocalreg.so"#added by eric
> #(0x6d3413a0,0xca0c,0x11dc,0x95,0xff,0x08,0x00,0x20,0x0c,0x9a,0x66),"libopencore_ffmpeglocalreg.so"#added by eric
> #(0x1d4769f0,0xca0c,0x11dc,0x95,0xff,0x08,0x00,0x20,0x0c,0x9a,0x66),"libopencore_asflocalreg.so"
> #(0x6d3413a0,0xca0c,0x11dc,0x95,0xff,0x08,0x00,0x20,0x0c,0x9a,0x66),"libopencore_asflocalreg.so"
Files 0818/system/etc/security/otacerts.zip and 0827/system/etc/security/otacerts.zip differ
Files 0818/system/framework/am.jar and 0827/system/framework/am.jar differ
Files 0818/system/framework/android.policy.jar and 0827/system/framework/android.policy.jar differ
Files 0818/system/framework/android.test.runner.jar and 0827/system/framework/android.test.runner.jar differ
Files 0818/system/framework/bmgr.jar and 0827/system/framework/bmgr.jar differ
Files 0818/system/framework/core.jar and 0827/system/framework/core.jar differ
Files 0818/system/framework/ext.jar and 0827/system/framework/ext.jar differ
Files 0818/system/framework/framework.jar and 0827/system/framework/framework.jar differ
Files 0818/system/framework/framework-tests.jar and 0827/system/framework/framework-tests.jar differ
Files 0818/system/framework/ime.jar and 0827/system/framework/ime.jar differ
Files 0818/system/framework/input.jar and 0827/system/framework/input.jar differ
Files 0818/system/framework/javax.obex.jar and 0827/system/framework/javax.obex.jar differ
Files 0818/system/framework/monkey.jar and 0827/system/framework/monkey.jar differ
Files 0818/system/framework/pm.jar and 0827/system/framework/pm.jar differ
Files 0818/system/framework/services.jar and 0827/system/framework/services.jar differ
Files 0818/system/framework/svc.jar and 0827/system/framework/svc.jar differ
Only in 0827/system/lib: Android.mk
Only in 0827/system/lib: busybox
Files 0818/system/lib/egl/libEGL_VIVANTE.so and 0827/system/lib/egl/libEGL_VIVANTE.so differ
Files 0818/system/lib/egl/libGLES_android.so and 0827/system/lib/egl/libGLES_android.so differ
Files 0818/system/lib/egl/libGLESv1_CM_VIVANTE.so and 0827/system/lib/egl/libGLESv1_CM_VIVANTE.so differ
Files 0818/system/lib/egl/libGLESv2_VIVANTE.so and 0827/system/lib/egl/libGLESv2_VIVANTE.so differ
Only in 0827/system/lib: etc
Files 0818/system/lib/hw/hwcursor.default.so and 0827/system/lib/hw/hwcursor.default.so differ
Files 0818/system/lib/hw/overlay.default.so and 0827/system/lib/hw/overlay.default.so differ
Files 0818/system/lib/hw/sensors.default.so and 0827/system/lib/hw/sensors.default.so differ
Only in 0827/system/lib: inshal
Files 0818/system/lib/libavcodec.so and 0827/system/lib/libavcodec.so differ
Files 0818/system/lib/libavformat.so and 0827/system/lib/libavformat.so differ
Files 0818/system/lib/libavutil.so and 0827/system/lib/libavutil.so differ
Files 0818/system/lib/libcamera.so and 0827/system/lib/libcamera.so differ
Files 0818/system/lib/libcamif.so and 0827/system/lib/libcamif.so differ
Only in 0827/system/lib: libevdoproc.so
Files 0818/system/lib/libGAL.so and 0827/system/lib/libGAL.so differ
Files 0818/system/lib/libhwdecinterface.so and 0827/system/lib/libhwdecinterface.so differ
Only in 0827/system/lib: libigps.so
Only in 0827/system/lib: libJNIforOSD.so
Only in 0827/system/lib: libJNIforTheatreModeService.so
Files 0818/system/lib/liblx_ipc.so and 0827/system/lib/liblx_ipc.so differ
Files 0818/system/lib/libomx_aacdec_sharedlibrary.so and 0827/system/lib/libomx_aacdec_sharedlibrary.so differ
Files 0818/system/lib/libomx_amrdec_sharedlibrary.so and 0827/system/lib/libomx_amrdec_sharedlibrary.so differ
Files 0818/system/lib/libomx_amrenc_sharedlibrary.so and 0827/system/lib/libomx_amrenc_sharedlibrary.so differ
Files 0818/system/lib/libomx_avcdec_sharedlibrary.so and 0827/system/lib/libomx_avcdec_sharedlibrary.so differ
Files 0818/system/lib/libomx_avcenc_sharedlibrary.so and 0827/system/lib/libomx_avcenc_sharedlibrary.so differ
Files 0818/system/lib/libomx_imapdec_sharedlibrary.so and 0827/system/lib/libomx_imapdec_sharedlibrary.so differ
Files 0818/system/lib/libomx_m4vdec_sharedlibrary.so and 0827/system/lib/libomx_m4vdec_sharedlibrary.so differ
Files 0818/system/lib/libomx_m4venc_sharedlibrary.so and 0827/system/lib/libomx_m4venc_sharedlibrary.so differ
Files 0818/system/lib/libomx_mp3dec_sharedlibrary.so and 0827/system/lib/libomx_mp3dec_sharedlibrary.so differ
Files 0818/system/lib/libomx_radec_sharedlibrary.so and 0827/system/lib/libomx_radec_sharedlibrary.so differ
Files 0818/system/lib/libomx_sharedlibrary.so and 0827/system/lib/libomx_sharedlibrary.so differ
Only in 0827/system/lib: libomx_wmadec_sharedlibrary.so
Files 0818/system/lib/libopencore_author.so and 0827/system/lib/libopencore_author.so differ
Files 0818/system/lib/libopencore_common.so and 0827/system/lib/libopencore_common.so differ
Files 0818/system/lib/libopencore_download.so and 0827/system/lib/libopencore_download.so differ
Files 0818/system/lib/libopencorehw.so and 0827/system/lib/libopencorehw.so differ
Files 0818/system/lib/libopencore_mp4local.so and 0827/system/lib/libopencore_mp4local.so differ
Files 0818/system/lib/libopencore_net_support.so and 0827/system/lib/libopencore_net_support.so differ
Files 0818/system/lib/libopencore_player.so and 0827/system/lib/libopencore_player.so differ
Files 0818/system/lib/libopencore_rtsp.so and 0827/system/lib/libopencore_rtsp.so differ
Files 0818/system/lib/libosd.so and 0827/system/lib/libosd.so differ
Files 0818/system/lib/libparser.so and 0827/system/lib/libparser.so differ
Files 0818/system/lib/libreference-ril.so and 0827/system/lib/libreference-ril.so differ
Files 0818/system/lib/libui.so and 0827/system/lib/libui.so differ
Only in 0827/system/lib: libwmapro.so
Files 0818/system/lib/modules/galcore.ko and 0827/system/lib/modules/galcore.ko differ
Only in 0827/system/lib/modules: rt2070sta.ko
Only in 0827/system/lib/modules: rt3070sta.ko
Only in 0827/system/lib: overlay.default.so
Only in 0827/system/lib: README
Only in 0827/system/lib: rt3070_readme
Only in 0827/system/xbin: chat
Files 0818/system/xbin/crasher and 0827/system/xbin/crasher differ
Files 0818/system/xbin/oprofiled and 0827/system/xbin/oprofiled differ