Throne Room most often.

Perhaps I lurk most often in the EB forum - soaking up some of the historical expertise and creative modding going on there.

Also the Backroom - soaking up some of the contemporary lack of expertise and creative grandstanding going on there.

The main games forums are rather quiet now - there was a time the Citadel was flooding with more material than I could keep on top of. However, ETW is picking up and it is nice to see CA staff posting there quite often.

I also check on the Arena religiously. There is more to life than Total War. There are other computer games ... and stuff...