Extra Credits, Escape to the Movies, LoadingReadyRun and ENN.
I watch Yahtzee, Extra Credits and Escape to the Movies as soon as they come out or the day after at most, LoadingReadyRun I check out once in a while and ENN is for when I'm really bored (they're not bad, I do watch them for fun, just not spectacular in most cases).
I also check out the Reviews section once in a while, though sadly most games don't manage to interest me. I think they did lead me to finally try Prototype (blood/gore/mutants were off-putting at first), even if it was Yahtzee's description of "emo Peter Pan" flying technique that sealed the deal. Also they have Susan!
I used to watch Unskippable, but got a bit bored, older episodes were much better.