Hi! My first post, thought I'd start with something constructive :) Even if the topic seems somewhat stale :X

I'm surprised it's not in any sticky with must-reads for artists yet:

CtrlPaint.com !

Especially useful if you didn't go through art school, 100's of bite-sized videos that will get you kickstarted on art basics and give your art an immediate rocket-boost.

Also related:

http://artschoolexercises.tumblr.com/

Sounds like a very interesting concept, and so far it's had some great material in it...let's see if this keeps up :)