Question
So, I'll be getting my T-Mobile G1 within a month or so, and I'm excited to start developing for it.
Has anyone started using it yet? Is there a dev wiki or anything set up for it yet?
Solution
This is probably the best place to go. However, a good search on google will most likely take you to one of these discussion anyways. Here, you can discuss about your difficulties possibly with the core developers too.
They're probably the most active groups so far (as of Sun, April 20, 2008) online regarding the development and the interactive community around android. Apart from the official google groups and the irc channel at #android on irc.freenode.net, they're probably the best place to go or ask questions.
Development halted here but still some rather interesting things that have been done.
Didn't see much development things
A nice little repository, not a lot of files though.
I pulled it from my development wiki which hasn't been updated for a while but best of luck working with Android ... and T-Mobile G1
Solution
No need to wait, the Android SDK has an emulator which works pretty well and looks suspiciously like the HTC Dream. Besides you wouldn't want to put code directly on your phone without testing it in an emulator of some sort anyway.