Association of American Editorial Cartoonists
Full time editorial cartoonists, student cartoonists and others with an interest. Portfolios, awards, and history, especially of Thomas Nast.

Illustrators' Partnership
Promoting artists' rights to make money on their own work.

Jakob Nielsen's Alertbox
Advice on Web design from a leading consultant and author on usability. Check out the archive of favorite articles.

Society of Illustrators
Fine illustration. Based in New York City.

Starving Artists Law
Especially for cartoonists. Links to volunteer lawyers, syndicate contracts, and info on copyright and trademark law.