It looks like a blog spammer.
This is a problem all over the net, unfortunately. We're looking into ways to help curb it if possible.
In the meantime, one thing you might do is set your options so you have to approve comments before they appear, then you can delete them before they appear instead of after. Go to your blog admin panel and select Options... Discussion... then check the box next to 'an administrator must always approve the comment'.
That will help prevent the comments from appearing, but there's nothing we can do to stop spammers from scraping our blog entries and forum posts to use on their blogs as content. Yep, they even automatically scrape (copy) our forum posts. It's an automated way of creating websites which then appear in search engines, and eventually earn money for the spammers. It sucks.