The Amiga sites I frequent.
This one.. ;-)
Amibay.com (a lot of trading/sales, but there are some GREAT hardware help/fixit guys/gals there..)...
(Note, they do have some rules about trading/sales that rub people the wrong way. Good or bad, it's who they are..)
EAB.abime.net - Great general purpose site with some really smart people there as well... (Toni from WinUAE is there all the time, among others) A lot of great game/demo history knowledge there..
Lemonamiga.com Mostly for gaming, but a fun site with some great people...
I know there are others.. If I spoke more German (more that none), A1K.org looks good. (There is an English speaking forum section, but the real fun stuff generally appears in their German forums..)
One thing to remember about the sites with less of the chatter, is that frequently they get there and stay there by being much more tightly moderated...
I like the variety..
desiv