Okay, figured out how to create feeds in WordPress 2.7 that will exclude a certain category. I really wish this stuff were better documented. As in, I shouldn’t have to read any docs or google for examples, but immediately wake up one day with this knowledge.
Anyway, here’s a case of my feed for all posts *minus* the new Religion one I’m starting to add stuff to: http://wonkabar.org/feed/?cat=-5
Also, if you want to do more than one, looks like they just need to be comma separated:
Just drop the minus sign if you actually want to include them instead of exclude. As for figuring out what the IDs of your categories are … well, have fun. I just guessed.