Options for now:
* create a greasemonkey script to hide posts from the sources you don't want. Every source has a unique CSS class so it should be trivial.
* create a yahoo pipe to filter the sources you don't want through the rss feed and read it through a feed reader
* clone the set of sources using the OPML feed in your feed reader of choice and add/remove whatever you want from the source list. However, this will not be kept in sync in the likely event that the official set of sources should change.
Out of curiosity, what don't you want to see and why?
After input from many of you guys and the NYC group, I am announcing planetrationalist.com
There's a lot of different directions this sort of idea could go in, but I figured that this could be a good-enough first effort.
Enjoy, and let me know what you think.