Just came across an interesting site, Share your OPML where users are requested to upload their aggregator's subscription list in OPML format. Right now its just a beauty contest of the most popular. Some people on the rss-user mailing list have suggested things like, obscure feeds, feeds rising in popularity, etc. Those will make it more interesting. Of course none of this is scientific since it is a self-selecting population of contributors, but it has potential to be neat.
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