What are good community sites for my HTC Tattoo Android GSM phone?

Q. Looking for the best forums sites ore wikis about using the phone and important software (like Google maps) Something like this one for a quite different product:
http://screenplayprohd.wikia.com/wiki/ScreenPlay_Pro_HD (quite different product).

One thing I am not sure about is how much this phone has in common with other Android phones or other Android phones from HTC.

A. There are several online forums which talk about the HTC Tattoo Android GSM phone. I will list them in order from best (most users, most discussion threads) to the less popular but still worthwhile ones.