Arduino uno vs Arduino Mega rev3 for AT communication and ADB communications

I don't think that either one will work for talking adb. I'm not clear on whether adb uses USB or TCP/IP as its communications layer. If USB, then you MIGHT want a "MEGA ADK" which has a USB port that connects to phones. If TCP/IP, then you'll need some sort of networking shield (and you'd want MEGA-sized program memory, at least.

Did you see Google Code Archive - Long-term storage for Google Code Project Hosting. ?