merge rss feeds

Question

I want to merge multiple rss feeds into a single feed, removing any duplicates. Specifically, I'm interested in merging the feeds for the tags I'm interested in.

[A quick search turned up some promising links, which I don't have time to visit at the moment]

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Broadly speaking, the ideal would be a reader that would list all the available tags on the site and toggle them on and off, allowing me to explore what's available, keep track of questions I've visited, new answers on interesting feeds, etc, etc . . . though I don't suppose such a things exists right now.

As I randomly explore the site and see questions I think are interesting, I inevitably find "oh yes, that one looked interesting a couple days ago when I read it the first time, and hasn't been updated since". It would be much nicer if my machine would keep track of such deails for me :)

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Update: You can now use "and", "or", and "not" to combine multiple tags into a single feed: Tags AND Tags OR Tags

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Update: You can now use Filters to watch tags across one or multiple sites: Improved Tag Stes

Answer 1

Have you heard of Yahoo's Pipes.

Its an interactive feed aggregator and manipulator. List of 'hot pipes' to subscribe to, and ability to create your own (yahoo account required).

I played with it during beta back in the day, however I had a blast. Its really fun and easy to aggregate different feeds and you can add logic or filters to the "pipes". You can even do more then just RSS like import images from flickr.