Dave Winer has introduced a new tool.
The purpose of Share Your OPML, from the description in the FAQ:
is to gather a community of subscription lists, in OPML format, and aggregate them in interesting ways.
Now here’s where it gets really interesting. Once a statistically significant number of users have joined and uploaded, you can start to track trends – users with similar interests to yours, which feeds are more or less popular with what audiences, who’s reading your feed, who’s paying attention to what. In other words, all the things us marketers are supposed to be obsessed about.
If you don’t know what OPML is, don’t worry. If you are using a newsreader or aggregator to follow your favorite blogs, OPML is a file format you are already using. Just export your list of subscriptions and you’ll have a file all ready to upload to Share Your OPML.
Mike Arrington has a review with more details.
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