Wordpress: RSS by Category

Dear Wordpress Users,

I need to have a separate RSS generator that will create RSS based on the categories on my blog. Simply put, I want to have a separate RSS for geek stuff and open source stuff, so that (ehem) Planet MyOSS will not pick up pr0n personal postings from this site.

I am only interested in a working plugin. No, I don't need ideas or something along the line of 'dude since you know PHP can't you just code that stuff?' No suggestions either. Just the source, please.

UPDATE: Using the permalink structures, the RSS feed for each category can be retrieved by appending 'rss' or 'feed' at the end of the URL (example 1, example 2) will generate RSS feeds for a specific category. This is not really what I want since I want to put my other categories into one RSS (but not the geek-stuff) since most of my (ehem) loyal fans aren't interested geekery magic, but it works for the time being.

Your Lazy Wordpress User,

--spoonfork
p/s: Kitchen utensils are fun if used the right way.