I think it would be interesting to see additional application specific reputation chains launch. We could have the equivalent of eBay feedback ratings on a one year (or however long) rolling chain secured with POW and reputation risk to kill spam. We could have dynamic webs of trust for distributed accreditation for basically any particular task or product, with a standard aggregate-able review structure for each domain. This could replace diplomas and resumes completely.
If I'm missing any existing plans for implementing these functions, I'd appreciate links.