Wasted screen space
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csyntax
About 80% of the screen space is an empty window for 99% of the time, unless someone is in chat then the main window is just empty.
Why not have a scrolling list of visitors, pages they are on or something in that space? At the moment you have to grab the mouse, move over a visitors IP address and click to see details of who they are etc. This information could be displayed in full in the main part of the screen so you can see which sites are getting visitors with just a glance at the screen.