Share your OPML is an interesting concept. Upload your OPML file showing all of the feeds that you subscribe to… then use the site to compare to what others are reading, find new feeds, and so on.
The inner geek in me gets a kick out of looking at this site and seeing what others are reading.. but like most geek sites, I see alot of inbreeding going on over there. A-Listers reading A-Listers, and so on.
The real challenge, the one that Arrington talks about in his post, is how to get more folks to ‘Share their OPML’ on the site.
The real question though is will we ever get enough OPMLs on this site to make it a true measurement method.. right now, I don’t trust the metrics at this site.