For inspiration: Sketchblog Links

about.com's section on drawing and sketching
Anthony Zierhut's sketchblog
Ray Frenden's sketchblog
Chris Tessmer's sketchblog
Kristen McCabe's sketchblog
The Pants Press LJ sketchblog community
The Daily Scribble sketchblog community

For participation: Sketching Links

The "Daily Drawing" Yahoo!group
The "SketchIt" Yahoo!group
The "Daily Doodle" LJ community
Cathy Johnson's online course
Rebekah Lynn's online tutorials and tips (free)