I have the Google Voice app on my Blackberry and on my G1. The Android version is sooo much better. I love it! It is so well integrated into the operations of the phone that I could fully conceive of permanently switching my phone number to my new GV number. The problem I have with the Blackberry version is that it it is too simple. One feature I would love to see is the ability to do a custom ring for GV incoming calls AND the ability to have Caller ID at the same time. At present it is EITHER caller ID OR a custom ring for the single GV number. Hopefully the GDT will get there.