HOW TO: Merge Multiple Rss Feeds Into One With Feedburner And Yahoo Pipes
One of the very popular question in the FeedBurner FAQ is about merging XML feeds from different sources (like Blogger, WordPress, Flickr, Twitter, Jaiku) and then syndicate the entire content as one FeedBurner feed. This is desirable because a single feed makes it extremely easy for your subscribers to track new content and updates from you.
Though FeedBurner doesn’t provide any native feed mixing service, you can use the excellent Yahoo! Pipes service to combine two or more feeds and burn them into a single FeedBurner feed. Merge Multiple RSS Feeds Into One with Yahoo! Pipes + FeedBurner at Digital Inspiration - Software Reviews, Internet and Technology Guide