From Jeff Chandler’s “Calais Offers WordPress Plugin Bounty“:

Calais which is a metadata generation web service that is powered by Reuters is offering up a $5,000.00 bounty to anyone who can develop a plugin that meets the following criteria: tag auto suggestion, semantic cloud, GUID incorporation.

I can’t go for this one, having other immediate priorities and commitments, but it sounds like a neat and challenging project to tackle.