Artist Sketchbooks, is quite awesome. It's essentially an iPhone app that does nothing more than show images; but at the same time, it's a little publishing house. Indie artists can sell their wares (images) through the App Store via a little app. How awesome is that?
What would also be cool is a web app based version of this, ala Pie Guy, so indie artists who just want to give their stuff away can. By making it a web app, you could just skip the App Store all together.
I think this idea would be a perfect fit for deviantART.