http://www.trackle.com/
Track a whole bunch of stuff online, automatically. Seems to be an RSS aggregator on steroids with a catalogue function built in so you can "shop" for feeds...
http://www.xfruits.com/
xFruits is a sort of Yahoo! Pipes type service where you can take content and munge it into different forms. RSS to Atom, RSS to email, x RSS to 1 RSS, etc, etc.