Sylar stopped Peter from dying by slowing down his fall when he threw him out the window. I'd say that means he's still on the good guys side. He's biding his time to take out Pa Petrelli. Speaking of Pa, the actor playing him seems like he sucks.
I'm getting tired of all of the "in cased you missed it" dialogue. "Why didn't Peter die from falling 7 stories" got said probably 3 times at the end of the episode. This show is a flaming **** sandwich and I may be about done... it is a shame to, because I really wanted to blame last season on the strike... but instead it looks like they just ran out of steam.
Sadly, it seems that "Heroes" is quickly turning into a soap opera. A bad one. When that show started, I was hoping that they would run it similar to "X Files", with a deep, dark central thread that is touched upon every once in a while, and individual episodes that are self-contained most of the time, but oh well...