Hey, you forgot Mortality.net!
I spend some time at Mortality, since it covers all editions, and I still play and like the older editions as well as 3E.
I spend a lot of time at the Necromancer Games forum posting on occasion, and the KenzerCo forums though I just lurk there. I visit the Troll Lord, SSS, and Fast Forward sites on occasion.
I don’t visit the other sites on the poll really…I go onto the WOTC OOP board on occasion, and if ENWORLD has a link to Monte’s reviews/rants or LOS, I’ll usually read those (I don’t buy his products, but I usually enjoy what he has to say). But that’s about it. I usually find all I need here for 3E, oh and I hit the D20 Middle Earth page a bit.
I spend a lot more time on other gaming forum/sites , mostly lurking…but I post on occasion…I suspect since there is not as much support (web or otherwise) for my fave games, and there is such a glut of D20 stuff both published, and web sites/support, etc. That I find other game sites more interesting and refreshing…I can only look at so many reviews of the same D20 products over and over, new feats and Prclasses over, and over…homebrew campaigns over and over, etc. It’s overkill.
The places I frequent for other games are Lejendary.com, SWRPGNETWORK, GoO, The Exalted forum at WW, RPG.net, ICE forums, Glorantha.com, I peruse the mostly defunct Earthdawn sites, HERO forums, Decipher (anxiously awaiting the new LotR RPG) and I spend a lot of time on Ebay looking for old gaming items that I once had and sold, or just want to get (mint copies of the original cover 2E PHB and DMG on the way as I type).
So in essence, if it’s 3E I want, then ENWORLD pretty much has all the bases covered with a few exceptions like Necromancer, and KenzerCo.