What would the widget on your site do? Suggest other website that are similar to yours? Seems kind of counter productive if your goal is to retain visitors.

What would the widget on your site do? Suggest other website that are similar to yours? Seems kind of counter productive if your goal is to retain visitors. I've toyed with the idea of making a similarity service for publishers, or perhaps a wordpress plug-in. Moreofit would receive a set of URLs, and you could query it with a URL and receive the most similar amongst the set. I imagine this would be very useful for large sites such as SmashingMagazine, where finding similar articles on keyword alone will fail, and the site is so big that manually digging up related articles would be a pain. Instead, just drop in an iframe or script and moreofit will show a list of n most similar articles from your domain (or set of links).