[Nook HD, HD+ Android Development] pinguy1982:
Here are my tweaks: (Already built into this ROM)

Universal tweaks to Build.prop

#Networking
wifi.supplicant_scan_interval=180
ro.ril.disable.power.collapse=1
ro.ril.transmitpower=true
ro.ril.hep=1
net.ppp0.dns1=8.8.8.8
net.ppp0.dns2=8.8.4.4
net.rmnet0.dns1=8.8.8.8
net.rmnet0.dns2=8.8.4.4
net.dns1=8.8.8.8
net.dns2=8.8.4.4
net.tcp.buffersize.default=6144,87380,110208,6144,16384,110208
net.tcp.buffersize.wifi=262144,524288,1048576,262144,524288,1048576
media.stagefright.enable-player=true
media.stagefright.enable-meta=true
media.stagefright.enable-scan=true
media.stagefright.enable-http=true
media.stagefright.enable-rtsp=true
media.stagefright.enable-record=true
#Misc
ro.media.enc.jpeg.quality=100
ro.media.dec.hprof.vid.quality=100
ro.media.dec.jpeg.memcap=20000000
ro.media.enc.hprof.vid.bps=20000000
ro.media.dec.aud.wma.enabled=1
ro.media.dec.vid.wmv.enabled=1
ro.media.cam.preview.fps=0
ro.media.codec_priority_for_thumb=so
ro.media.enc.hprof.vid.fps=65
persist.sys.NV_FPSLIMIT=65
persist.sys.use_dithering=2
debug.overlayui.enable=1
persist.sys.ui.hw=1
video.accelerate.hw=1
ro.fb.mode=1
hw3d.force=1
debug.sf.hw=1
debug.enabletr=true
debug.qctwa.preservebuf=1
dev.pm.dyn_samplingrate=1
persist.sys.composition.type=c2d
debug.composition.type=gpu
debug.composition.type=cpu
debug.performance.tuning=1
ro.sf.compbypass.enable=0
persist.sys.purgeable_assets=1
debug.egl.hw=1
debug.egl.profiler=1
ro.vold.umsdirtyratio=20
windowsmgr.max_events_per_sec=90
persist.sys.smoothscrollbar=true
ro.max.fling_velocity=12000
ro.min.fling_velocity=8000
touch.presure.scale=0.001
ro.config.hw_menu_unlockscreen=false
debug.mdpcomp.maxlayer=3
debug.gr.numframebuffers=3
debug.gr.swapinterval=1
persist.sampling_profiler=0
dev.pm.gpu_samplingrate=1
#Disable the ADB notification Icon
persist.adb.notify=0
#Disable Google OTA Update checkin
ro.config.nocheckin=1
#Disable Google Report service
profiler.force_disable_err_rpt=1
profiler.force_disable_ulog=1
#Disable Logcat
logcat.live=disable
#Dalvik Tweaks
dalvik.vm.execution-mode=int:jit
dalvik.vm.dexopt-flags=m=y
dalvik.vm.checkjni=false
dalvik.vm.dexopt-data-only=1
dalvik.vm.verify-bytecode=false
dalvik.vm.lockprof.threshold=500
dalvik.vm.jmiopts=forcecopy
persist.sys.dalvik.multithread=false
#For Nook HD+ Only
dalvik.vm.heapstartsize=8m
dalvik.vm.heapgrowthlimit=79m
dalvik.vm.heapsize=258m
dalvik.vm.heaptargetutilization=0.75
dalvik.vm.heapminfree=2m
dalvik.vm.heapmaxfree=8m
#Zygote
ro.zygote.disable_gl_preload=true
#Memory Hacks
ro.HOME_APP_ADJ=1
ENFORCE_PROCESS_LIMIT=true
ro.sys.fw.bg_apps_limit=12
ro.config.low_ram=true
#HWUI TWEAKS
ro.hwui.disable_scissor_opt=false
ro.hwui.texture_cache_size=24
ro.hwui.layer_cache_size=16
ro.hwui.gradient_cache_size=0.5
ro.hwui.patch_cache_size=128
ro.hwui.path_cache_size=4
ro.hwui.shape_cache_size=1
ro.hwui.drop_shadow_cache_size=2
ro.hwui.r_buffer_cache_size=2
ro.hwui.texture_cache_flush_rate=0.6
ro.hwui.text_small_cache_width=1024
ro.hwui.text_small_cache_height=256
ro.hwui.text_large_cache_width=2048
ro.hwui.text_large_cache_height=512
hwui.text_gamma_correction=lookup
hwui.text_gamma=1.4
hwui.text_gamma.black_threshold=64
hwui.text_gamma.white_threshold=192
hwui.use_gpu_pixel_buffers=true
hwui.render_dirty_regions=false
hwui.use.blacklist=true
#BATTERY TWEAK
ro.mot.eri.losalert.delay=1000
pm.sleep.mode=1
#Enable Quick Power-On mode
ro.config.hw_quickpoweron=true

Sound Tweaks to build.prop (must include Sound_Engine.zip in the ROM).

#Beats/Sony
ro.product-res-path=framework/SemcGenericUxpRes.apk
ro.somc.sforce.supported=true
ro.service.swiqi3.supported=true
persist.service.swiqi3.enable=1
tunnel.decode=true
tunnel.audiovideo.decode=true
persist.speaker.prot.enable=false
media.aac_51_output_enabled=true
dev.pm.dyn_samplingrate=1
htc.audio.global.state=0
htc.audio.lpa.a2dp=0
htc.audio.global.profile=0
htc.audio.q6.topology=0
htc.audio.enable_dmic=1
persist.htc.audio.pcm.samplerate=44100
persist.htc.audio.pcm.channels=2
persist.audio.fluence.mode=endfire
persist.audio.vr.enable=false
persist.audio.handset.mic=analog
htc.audio.swalt.mingain=14512
htc.audio.swalt.enable=1
htc.audio.alc.enable=1
#Bravia Engine Service
ro.service.swiqi2.supported=true
persist.service.swiqi2.enable=1
#Sony Xloud & Clearbass +
ro.semc.sound_effects_enabled=true
ro.semc.xloud.supported=true
persist.service.xloud.enable=1
ro.semc.enhance.supported=true
persist.service.enhance.enable=1
ro.semc.clearaudio.supported=true
persist.service.clearaudio.enable=1
ro.somc.dmnorm.supported=true
persist.service.dmnorm.enable=1
ro.sony.walkman.logger=1
ro.somc.clearphase.supported=true
persist.service.clearphase.enable=1
mpq.audio.decode=true
#Resampling
af.resampler.quality=255
persist.af.resampler.quality=255
#Beats Engine
htc.audio.swalt.enable=1
htc.audio.swalt.mingain=14512

Zips are NOT flashable. Must add them manually to a ROM.