Combine RSS feeds into new feed?

By the way, I'm looking at the http://wiki.rayners.org/plugins/MultiBlog plugin for MT... but this basically means starting yet another blog within MT just to get its RSS feed... which I've yet to determine even works.

Feedburner is working on the arbitrary-feed-splicing functionality and is rumored to be close to releasing it.

Thanks for the quick replies. I installed MultiBlog, inserted its tags into my RSS/Atom index templates, and half an hour later, voila, locally-generated aggregate feed. I'll definitely keep an eye on Feedburner (so I can mix feeds across domains/CMSes), but this'll work great for now.

Here's how Eric Benson does it http://erikbenson.typepad.com/mu/2005/02/using_bloglines.html. I'd like to do this as well but am NOT using Movable Type and have been amazed at how this should be something easily doable but isn't, like how Feedpapers are supposed to work in Feedster, but don't. I have an all feeds feed on http://groups.blogdigger.com/index.jsp but some of my feeds don't really seem to show up there, or not until days later which is sort of not that useful.

You can also do it the kludgey way and make a friends list out of http://www.livejournal.com/users/librarian/ on livejournal. Of course someone has to then make feeds for your sites on livejournal, so I don't recommend this but it will work.

Here are some articles and resources on the subject:http://msdn.microsoft.com/asp.net/default.aspx?pull=/library/en-us/dnaspp/html/mergingrssfeeds.asphttp://www.gyford.com/phil/writing/2004/12/31/combining_rss_fe.php, by Phil Gyford.http://reblog.org/has a tool called http://reblog.org/refeed/README.html, which looks like it might be useful for combining and republishing feeds.You can also http://laughingmeme.org/magpie_blog/?p=61 with http://magpierss.sourceforge.net/, an RSS parser in PHP.Erik Benson http://erikbenson.typepad.com/mu/2005/02/using_bloglines.html to aggregate a number of feeds.I haven't tried this, so I can't give you any personal experience with any of these methods.

As long as all your content sources are in the one Movable Type instance you should be golden. However you want to branch out and incorporate other stuff, you might look at http://www.planetplanet.org/ which is a python based app that aggregates feeds together and creates a site and a combined RSS feed. Ignore the generated site and just use the combined RSS feed.

Thanks, everyone, for the additional links. I admit, while MT has annoyed me as of late, the simplicity of the MultiBlog solution was impressive. Still, I also run WordPress blogs, so cross-platform, cross-domain stuff will probably enter the picture eventually. As to Bloglines, Feedster Feedpapers, and LiveJournal... all are interesting, but require a third-party server to remain available. Ignore the generated site and just use the combined RSS feed. That's what I find so weird about most of the solutions out there. Even my MultiBlog solution comes with a dummy blog, when all I want is the feed.

yay multiblog!