Maybe this is new, maybe not, but I see Scott Ehrisman has a blog on editorial cartooning called SouthDaCola.com.

Scott is an absolute pain in the ass—and this is a compliment.  He is fearless in his views (even I have been in his cross hairs) and his art. That’s how we want our artists, whether we agree with them or not.  We want them to be truth tellers, or at least the truth as they see it.  Plus, the dude’s got talent.

He also notes that there is an editorial cartoon exhibit at the Horse Barn at Falls Park in Sioux Falls July 31, 2007 through September 4, 2007.  I will make it a point to attend and file a report.