Can I use (via wifi only) my original VZW Droid without a voice or data plan? I have a situation similar to Can I use an Android phone without an Internet access plan? but with one key difference, I don't even want to use it as a phone. Just a PDA.

I have an original VZW droid, the phone powers up and I can start apps etc; however, I cannot even connect to WiFi (it tries and fails with an error that just says unable to connect, try again). Is this a limitation of the phone being not activated? I used to use this phone as my every day driver, but I've since upgraded to a new phone, but would still like to use this droid as a wifi web browser around the house.
Yes you can, there shouldn't be any problem for using your phone as PDA only.