Probably What are you listening to? in the music forum. Although my favorite thread all-time is probably this CC Awards thread that I think was posted last year. It probably had the best combination of interesting/entertaining. Whoever posted that needs to be bring it back this year.
I remember that! Molly started it actually. She should make it annual, like the oscars. Anyone who wants to get more awards, can just go to Last Person to Post Wins xD
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My favorite thread right now is Streams, because that's where I find like-minded people and topics I find interesting. I like SYM too, it's a shelter thread away from all the drama xD
My all time favorite is, what can I say, the battlefield: LAST PERSON TO POST WINS!