Boy, I’m just a linking fiend today. The Blog Change Bot is effectively a bot running on AIM, that uses the Blogger XML feed of changed blogs, as well as the weblogs.com XML feed, and sends you an instant message when the blog you’re interested in changes. I don’t know if it would work properly for my site, as lately I’ve had some issues pinging through to weblogs.com when I update, but here’s a link if you’re interested.
