42. Illustration Class.

One of the more prolific illustrators out there, certainly if only in terms of web presence, Von Glitschka has a great resource for those using Adobe Illustrator called Illustration class. Although in it's early stages, the site already has a few tips that can make the difference between average and professional vector graphics. He is also responsible for bad design kills, and an interesting project called the doodle archive. Also check out vonster.com