Tim Ireland has been working on Blogcode. This is a weblog discovery tool, one simply rates sites on a series of metrics (this is done via a slider), and then a database is built which allows browsers to discover similar sites.
The site itself is well designed, but it does currently require browsers to go to the site and log in. Hopefully with the fullness of time plugins will be developed as well as 'Blogcode this site' buttons - to facilitate single click editing of the codes.
Blogcode is in early days, but already is worth playing with.