Auto-Mafia
Liking YTtalk
Just make sure your title is what the video is about, include good keywords... tags should really be keywords IMO. But use them as this. Dont put sexy and hot naked chick in your video unless you have one... get it? Make it real, but you only have so much space, this is what the optimizing is for... So test it out and use the relevant words that bring the most traffic.