I know that there is the Virtual Walkie Talkie app, which was a cool concept, but has been mostly ruined by children wishing to say **** on the radio. What other apps are available just between DROID users? I know that there are some iPhone to iPhone apps like the one that lets you bump phones and tranfer contacts or something. Doesn't Blackberry have it's own messaging system or chat or something? I would really like a true phone to phone PTT system, but I don't know if that is possible in just an app. What other interctive apps are there just between android phones?