Figured since our Tutorials thread is getting kind of unupdated, I'd plug in a few of my findings. Granted if you ever did a search on pixel art on google you'd find these in 5 minutes, but w/e =P
So You Want To Be A Pixel Artist? by Tsugumo
The Pixel Tutorial by Derek Yu
Designing Arcade Computer Game Graphics by Ari Feldman
And that's all I got o.0 There is alot of otehr stuff for isometric art and what not. Youc an easily find it
Here. Hope this helps everyone =)