Opml, la sigla da tenere d'occhio; adesso c'è Share Your Opml

MicroPersuasion - Share Your OPML is a Killer Attention App
In sostanza un file per esportare e condividere la lista dei feed rss che ognuno ha sottoscritto

OPML, short for outline processor markup language, is basically an XML file organized in an outline format. One way it is used is for creating portable lists of RSS feeds that they can be easily shared. For example, if you're a Bloglines user and you hit Bloglines.com/export and save the OPML file to your computer you can re-import this file in any other desktop or web-based reader and all your feeds will carry over.
There's more though. The real value in OPML is in sharing these files in "reading lists."

That's the big idea behind Dave Winer's new Share Your OPML site. First, you upload your OPML file (the list of RSS feeds to which you subscribe). Then you can see who subscribes to the same feeds that you do. For example, here's who subscribes to my feed. You can also browse lists of the top 100 feeds, the biggest blog junkies and much more.