Oliver Jeffers deftly combines whimsical cartoons with abstract collage and type. He recently opened up a Shop section where you can purchase his picture books and selected prints featuring artwork from these books.
Jesse Kuhn illustrates various subjects, but his star project is an educational product called The Quirkles. Check out the fun Quirkles and their projects here.
Beatriz Iglesias works with super cute characters in her kids' illustrations. But that's not all she draws - scroll down her site to see examples of her more adult work.
Aaron Blecha has a very fun site that is loaded with wacky illustrations of monsters, mad scientists and other minions. Check out his super animation reel for a glimpse of his critters in action!
Sean Ashby specializes in children's illustration featuring lush woodcut-style paintings with a cartoony bent. He does some interesting things with his heavy outlines, combining colors and line work to great effect.
Illustrophile is a blog showcasing illustrators new and old, from around the world. It is run by Charlene Chua, herself an illustrator based in Toronto.
Please send site suggestions etc to illustrophile[AT]gmail.com, or use the form on the Contact page.