Jurgen (jtwine) has perhaps the most relevant posts on twitter.
And his page is beautiful.
Other artists there post stuff to #twitterart?
The little twitter bird logo scares the fuck out of me so I can't say much on that.
However I will say that Jurgen Trautwein makes lots of goodness.
Much of it is on the web here and here for starters.
The drawings! And photography. Music.
He handles black better than most.
Not that he can't handle white.
Or color.
He lives in San Francisco.