Phirebrush has a new issue up. Collection of works from the artists in their web community.
Go to DigitalArt.org to check all kinds of digital art from paintings, to photo manip., to 3-d stills. Really good site for lots of art from around the world.
Check out Angry Blue for a lot of cool illustrations and cool web design.
Dubtastic has a beautiful web design with lots of good resources like brushes and tutorial. Check it out I've gotten a lot of inspiration from him.
My colleagues at Bowling Green State University have cool sites that are worth checking out. Digital Arts at BGSU