My favorite LPer is http://www.youtube.com/user/Kikoskia, I don't really watch LPs that often though.

AuzzieGamer has to be my favourite LPer. Unfortunately, he's rather foul-mouthed, so I can't link him (his Hitman Blood Money LPs are bloody hilarious).

I watch SSoHPKC, but that's about it. I considered doing my own lets play, but it seems awkward to have to talk into a mic about random stuff to people you don't know. I guess if you talk to yourself you could do it.

Also NintendoCapriSun.

http://www.youtube.com/user/SSoHPKC and http://www.youtube.com/user/NintendoCapriSun?blend=1&ob=5