Are there any RSS feed autodiscovery tools that output feed URL when given a site URL?
I believe you could do this using the Yahoo! Pipes “Feed Auto-Discovery Module” [1]. Use the Fetch CSV Module then try putting the Feed Auto-Discovery into a Loop module. Pipes will output to CSV using “_render=csv”.
[1] http://pipes.yahoo.com/pipes/docs?doc=sources#FeedAutoDiscovery