This is the original hack from Dodo for b2, converted (the insides are completely different) to work well with WordPress 0.72. You can see it at work on my blog:
Test it out, make lots of comments, see what you think. I have made the instructions as simple and lucid as possible. If you have any questions, post on here or email me. You might have to tweak your CSS to suit yourself. I have tested the installation in both IE and Moz and it looks all right. :-P Let me know what you think!
Here is the link to the hack