RdfTree
I have about 80% of a Java RDF editor. It's not enough to be useful, and my Swing skills aren't really up to the task. But I believe it is a worthwhile project (I want an easy RDF editor) and am willing to put up a bounty for it.
I think for someone familiar with Swing it'll only be a couple hours work to make big progress, so for now I'm only putting up $400. The source is at:
svn://hyperdata.org/svn/rdftree
it's obvious what needs doing. I'll leave this open until March 2009 and then pay anyone who's stepped forward, and very probably offer another $700 for a couple more features.