To get rid of the commercial popups and banners in Imesh, go to: HKEY_LOCAL_MACHINE\SOFTWARE\iMesh\Client  in Regedit, and locate the values below: ChatUrl, Friend, TellaFriendUrl, And WhatsUpUrl. Then doubleclick them and delete the internetadress and press Ok.

I think there's a catch with this tweak, and that is that it comes up a dialogbox that says "The parameter is incorrect." And the Chat and What's Up page are blank and disabled