nerfhammer, FYI: I am the proprietor of "The Thinker" at http://thethinkerblog.com. Normally I don't let other sites scrape my feeds but would be willing to make an exception for Planet Rationalist. Might be a good idea if you could take only the posts tagged "Critical Thinking" though, so you do not get (e.g.,) beer reviews and the like ;-).
Thanks a lot!
I will limit aggregation to the Critical Thinking category as you suggest.
I am working on a rationality blog aggregator.
You can help by responding with some rationality-related blogs that you personally find valuable.
I'll announce here when I'm ready to release it publicly.