[wp-hackers] Feed Hooks?

[Tor Bjornrud]

I was looking through the hook api documentation and didn't see any 
hooks regarding how feeds are built.

I was thinking about writing a new page plugin that allowed for an 
extremely robust search engine, and as a bonus could be used to create 
custom RSS feeds.  An example of such a feed would be all posts about 
rss, games, or WordPress written by Bill.

Am I missing hooks somewhere?  If not, are people averse to this kind of 
functionality in WP?

~Tor