I finally found a substantive use for google voice. There's an app to run it from my Verizon Wireless Motorola Droid. I have tried it using WiFi. Next I'll try it using the Verizon Wireless 3G network. That should work, too.
When using the Verizon Wireless 3G network to make google voice calls, what will be increased:
1. voice plan minutes
2. data plan bytes?
If data plan bytes, it seems that one could use google voice all the time and not incur any voice plan minutes to make outgoing calls. That would be cool.