A couple things though:
1. So far I haven't found out how to get rid of the blue border around the entire sections of shouts.
2. I'd like to be able to allow Guests to only -view- the shoutbox and not post, and registered users be able to post. Otherwise this might lead to lots of spam.
But those are minor points ... great work!
1: Open the css file in your modules directory and the delete line 33 & 34
border: 1px solid #;
border-width: 1px 1px;
2: Beta has this option already :)