Stumbled upon Waypath today, which goes beyond the link analyzing that most of the other blogging ecosystem tools offer.
The Waypath Project's Related Weblog Navigation engine analyzes weblog entries to determine their core conceptual makeups, compares them with one another to find out how related they are, and presents you with its best guess as to what's related to your original input. This is done all automatically, using available technology.
Very cool. Plugged in my blog address, and got back an interesting list that included some sites I'd not encountered before, and liked very much.