[FeedBlendr][1] lets you combine and mix several RSS feeds into one. You can either enter feeds manually or import feed subscriptions form your FeedReader (as OPML file).

Extra Features:

- Combine as many feeds as you want.
- Supported feed formats: RSS, Atom and RDF feeds.
- Supports Feed enclosures: Combine your favorite podcast subscriptions into one.

  [1]: http://feedblendr.com/