Tittle says it all, what is your favorite skyrim lets play on youtube? my personal favorite is yogscast sips's lets play, it has to be the funniest vids I've seen in a long time, here is one of the best episodes so far hope you enjoy
A dude called voicesfromthedark has several Skyrim Let's Plays. I've watched a few hours of his Khajiit thief playthrough, and it's fantastic. He seems to lose his interest slightly as the series goes on, but the early episodes - which are quite roleplay heavy, but in a fun way - are a blast.