I've launched http://www.soundfolder.com
It's a simple service for musicians to publish tunes on the web. There are a hundred of these services already, but we're aiming to be 1) a bit nicer, and 2) profitable.
I don't think (self-funded) startups need to be based on a new-and-paradigm-shifting idea.
So the question is, what does HN prefer for bootstrappers, "better" or "revolutionary"?