Most del.icio.us, transparent error message ever
I was up on del.icio.us this afternoon, trying to find some enterprise 2.0 rss posts, and got this - the most fabulous, best error message ever:

I wish more software developers would be as transparent (and humorous) with their messages. It makes all the difference in the world to me that I know people are behind the software and systems we most often take for granted.