Well , Diettalk, I already have the avatar hack on my site.
It would be similar to what KloWn said but insteadof under username place it in the table at the bottom of the post. A small flag where it has the users post count and location.
Ive never done any perl or cgi hacking besides doing the step by step instructions that come with the hacks here. I would like to learn, but have no Idea where to start, I was wondering if anyone else was interested in this. And if so if you have some expirience in this would you mind working on it with me.