Ever since the server moved to a different city and platform, I suspect external web links have been broken due to some database cleanups/fixes I had to do to the data from the old server.
Previously, the blog would track exit clicks and tally them up. I'm a bit of a statistics geek so I always found that information interesting, but I'd rather have a working website than pretty graphs. I've removed that broken module for now.
I doubt I'll re-enable it because I don't like obfuscated web links in general. It is the same reason that any link I post in a blog entry has the tooltip set to the address of the web site linked.