Credit goes to
http://androidforums.com/members/sinfuldragon.html for originally providing this information. I added a step that needs to be completed for it to work properly.
Hopefully, you have Root Explorer (and if you don't, I highly recommend it because it's so worth the couple of bucks). Here are the instructions to prevent to the FRG22D OTA update (which I was getting yesterday myself):
1. In Root Explorer, go to /system/
2. Tap Mount R/W at the top, then long-press on
build.prop and scroll down to Open in Text Editor
3. Once the file is open as a text file, scroll down until you see the line that says: "ro.build.fingerprint=verizon/voles/sholes/sholes:2.2/FRG01B/45394:user/release-keys" and
change it to read as follows:
ro.build.fingerprint=verizon/voles/sholes/sholes:2.2/FRG22D/50454:user/release-keys
4. Then change line directly above that says description to match.
5. Tap the back key and say "Yes" when it asks you to save (it will automatically back up the original file for you)
6. Tap Mount R/O at the top
7. Reboot