I’ve been wanting to do this for a week or so, but only now got a minute to look it up. It’s actually really simple. Here are two different websites that explain how to do it:

Text&Images:
http://www.insidefacebook.com/2009/02/22/how-to-import-your-blog-into-facebook/

Video tutorial:
http://everything.typepad.com/blog/2009/01/how-to-add-your-blog-feed-to-your-facebook-profile.html

It seems to work, the only disadvantage I see so far being that the link to your actual blog doesn’t seem to show up in the notes. I guess you could fix this somehow, but I haven’t looked at it yet.