Potentially interesting stuff going on at http://share.opml.org.

Particularly compelling is the Subscriptions like mine section. Upload your OPML here and not only do you contribute to the ranked list, but you get the personalized Like Mine list.

For now the number of OPML files uploaded is small, but if tens of thousands of folks uploaded theirs one could get some interesting data. The tabular way things are being displayed now won't do that amount of data justice and will just get folks looking at "who's in the top 100." A graphical network view of the relationships between folks and who they read could be really interesting though.