Just ENWorld
I used to also follow the WotC forums, but over time I gravitated here. I once tried following dicefreaks, but their style is not really my style, so I decided not to join. Haven't really thought about joining other forums in a while, although if this list suggests a forum a few times as worthwhile I may consider it.
Part of the reason I eventually chose to leave the WotC forums was due to the noise to info ratio. Its rather loud over there - you really have to dig to find the gems of info. Also, I didn't like their general view towards third party books and pdfs (ie: all are inherently broken, irregardless of who published them, what is in them, etc). Some 3rd party works are broken, I can readily attest, but some are among the best options to have entered the world of d20.