Very similar to what I was thinking, pixel! Nice work.

One suggestion: on the main page, I think we should list just the number of users online and make that a link to another page with the actual list. That way we provide the high-level info but keep the screen clean. As a compromise, we could otherwise list maybe the top 3 most active (or use some other priority context, such as alphanumeric) users along with a symbol indicating that there are more, and again link to a longer list.

Gotta squeeze that geen hosting graphic in a corner somewhere too.

EDIT: oh, and I will get right on that logo. I think you guys will like the idea. I'll scan the rough and upload it later.