[G1 Android Development] forceshield:
cd data

# ls -l
ls -l
drwxrwxrwx 1 1000 1000 2048 Jan 28 20:17 anr
lrwxrwxrwx 1 0 0 14 Jan 28 20:52 app -> /system/sd/app
lrwxrwxrwx 1 0 0 22 Jan 28 20:52 app-private -> /system/s
d/app-private
drwxrwx--x 1 1000 1000 2048 Jan 28 20:17 dalvik-cache
lrwxrwxrwx 1 0 0 15 Jan 28 23:33 data -> /system/sd/data
drwxrwx--x 1 2000 2000 2048 Jan 28 20:17 local
drwxrwx--- 1 0 0 2048 Jan 28 20:17 lost+found
drwxrwx--t 1 1000 9998 2048 Jan 28 20:17 misc
drwx------ 1 0 0 2048 Jan 28 20:17 property
drwxrwxr-x 1 1000 1000 2048 Jan 28 20:17 system
#

cd system/sd/data

cd ..
# cd system
cd system
# cd sd
cd sd
# cd data
cd data
# ls -l
ls -l
drwxr-xr-x 4 10034 10034 1024 Jan 28 21:22 com.acme.android.powerma
nager
drwxr-xr-x 3 10002 10002 1024 Jan 28 20:17 com.amazon.mp3
drwxr-xr-x 4 10027 10027 1024 Jan 28 20:17 com.android.alarmclock
drwxr-xr-x 10 10026 10026 1024 Jan 28 20:17 com.android.browser
drwxr-xr-x 3 10025 10025 1024 Jan 28 20:17 com.android.bugreport
drwxr-xr-x 3 10024 10024 1024 Jan 28 20:17 com.android.calculator2
drwxr-xr-x 4 10023 10023 1024 Jan 28 20:17 com.android.calendar
drwxr-xr-x 3 10017 10017 1024 Jan 28 20:17 com.android.camera
drwxr-xr-x 3 10014 10014 1024 Jan 28 20:17 com.android.contacts
drwxr-xr-x 3 10022 10022 1024 Jan 28 20:17 com.android.email
drwxr-xr-x 3 10014 10014 1024 Jan 28 20:17 com.android.googlesearch

drwxr-xr-x 3 10020 10020 1024 Jan 28 20:17 com.android.htmlviewer
drwxr-xr-x 3 10019 10019 1024 Jan 28 20:17 com.android.im
drwxr-xr-x 3 10014 10014 1024 Jan 28 20:17 com.android.launcher
drwxr-xr-x 4 10016 10016 1024 Jan 28 20:17 com.android.mms
drwxr-xr-x 3 10015 10015 1024 Jan 28 20:17 com.android.music
drwxr-xr-x 3 10013 10013 1024 Jan 28 20:17 com.android.packageinsta
ller
drwxr-xr-x 4 1001 1001 1024 Jan 28 20:17 com.android.phone
drwxr-xr-x 4 10023 10023 1024 Jan 28 20:17 com.android.providers.ca
lendar
drwxr-xr-x 4 10017 10017 1024 Jan 28 20:17 com.android.providers.do
wnloads
drwxr-xr-x 4 10017 10017 1024 Jan 28 20:17 com.android.providers.dr
m
drwxr-xr-x 4 10014 10014 1024 Jan 28 20:17 com.android.providers.im

drwxr-xr-x 3 10019 10019 1024 Jan 28 20:17 com.android.providers.im
credential
drwxr-xr-x 4 10017 10017 1024 Jan 28 20:17 com.android.providers.me
dia
drwxr-xr-x 4 1000 1000 1024 Jan 28 20:17 com.android.providers.se
ttings
drwxr-xr-x 5 1000 1000 1024 Jan 28 20:17 com.android.providers.su
bscribedfeeds
drwxr-xr-x 4 1001 1001 1024 Jan 28 20:17 com.android.providers.te
lephony
drwxr-xr-x 5 1000 1000 1024 Jan 28 20:17 com.android.settings
drwxr-xr-x 3 10012 10012 1024 Jan 28 20:17 com.android.setupwizard
drwxr-xr-x 3 10011 10011 1024 Jan 28 20:17 com.android.soundrecorde
r
drwxr-xr-x 3 10008 10008 1024 Jan 28 20:17 com.android.sync
drwxr-xr-x 3 10001 10001 1024 Jan 28 20:17 com.android.term
drwxr-xr-x 3 10006 10006 1024 Jan 28 20:17 com.android.updater
drwxr-xr-x 5 10005 10005 1024 Jan 28 20:17 com.android.vending
drwxr-xr-x 3 10004 10004 1024 Jan 28 20:17 com.android.voicedialer
drwxr-xr-x 3 10037 10037 1024 Jan 28 21:09 com.angryredplanet.andro
id.rings_extended
drwxr-xr-x 3 10030 10030 1024 Jan 28 21:04 com.appdroid.anycut
drwxr-xr-x 5 10035 10035 1024 Jan 28 21:22 com.aws.android
drwxr-xr-x 3 10031 10031 1024 Jan 28 21:08 com.biggu.shopsavvy
drwxr-xr-x 3 10036 10036 1024 Jan 28 21:09 com.bonfiremedia.android
_ebay
drwxr-xr-x 3 10000 10000 1024 Jan 28 20:17 com.google.android.apps.
gtalkservice
drwxr-xr-x 3 10018 10018 1024 Jan 28 20:17 com.google.android.apps.
maps
drwxr-xr-x 6 10021 10021 1024 Jan 28 20:17 com.google.android.gm
drwxr-xr-x 4 10000 10000 1024 Jan 28 20:17 com.google.android.googl
eapps
drwxr-xr-x 4 10000 10000 1024 Jan 28 20:17 com.google.android.provi
ders.gmail
drwxr-xr-x 3 10039 10039 1024 Jan 28 21:10 com.google.android.radar

drwxr-xr-x 3 10010 10010 1024 Jan 28 20:17 com.google.android.stree
t
drwxr-xr-x 3 10007 10007 1024 Jan 28 20:17 com.google.android.talk
drwxr-xr-x 3 10003 10003 1024 Jan 28 20:17 com.google.android.youtu
be
drwxr-xr-x 3 10038 10038 1024 Jan 28 21:09 com.google.tts
drwxr-xr-x 3 1001 1001 1024 Jan 28 20:17 com.htc.fieldtest
drwxr-xr-x 3 10009 10009 1024 Jan 28 20:17 com.koushikdutta.superus
er
drwxr-xr-x 3 10029 10029 1024 Jan 28 20:58 com.myspace.android
drwxr-xr-x 3 10032 10032 1024 Jan 28 21:08 com.ringdroid
drwxr-xr-x 3 10033 10033 1024 Jan 28 21:08 com.shazam.android
drwxr-xr-x 5 10014 10014 1024 Jan 28 20:17 com.tmobile.myfaves
drwxr-xr-x 5 10028 10028 1024 Jan 28 20:27 com.weather.Weather
#

Looks right, not sure why I'm getting the error, as I am using the Data2ext2.bat which as stated above contains

adb shell mkdir /system/sd/data
adb shell cp -rp /data/data /system/sd
adb shell rm -r /data/data
adb shell ln -s /system/sd/data /data/data

Have rebooted afterwards with and without the USB cable attached to the computer.

Thanks so much for any help!