If you can't wait for the T-Mobile G1's release, or just couldnt figure out if it's available or not and missed your chance to pre-order, T-Mobile has released a pretty full-featured emulator to play around with. It doesn't have everything (GPS is missing and a few functions just give an error message) but it'll give you a good taste of what's to come on October 22nd. [Cell Phone Signal via Engadget Mobile]
I wouldn't say the emulator is anywhere near "pretty full featured"... I'm not ripping on giz I just think it's worth noting that there are many functional discrepancies between this and the sdk that I noticed (buttons don't do exactly what they actually do). This is a bit of a distortion of the term 'emulator'. If you want a preview of what android will be like, better to download the SDK. It is pretty-full-featured but missing some apps and functionality.