This is pretty cool. You upload or link your OPML and it mashes them all together with stats. Very simple and functional, which I like. You can see who subscribes to a given feed (mine), the Top 100 and even a list of who subscribes to the most feeds. Also you can get a “Subscriptions Like Mine” which ranks other users subscriptions against yours, which could be a good way to find some new feeds (as if any of us need any). So anyway, if nothing else, interesting place to keep your OPML. Here’s mine.