If you've progressed beyond the cardboard-and-scissors stage and need to collaboarate remotely. your essential tools are
(1) A scanner or digital camera
(2) A desktop sharing program such as Netmeeting or VNC
(3) Adobe photoshop or equivalent.
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the web is wonderful - if you assert there must be a tool, odd are there is one pretty close. Coccinella is a jabber client which has a whiteboard attachment. It's not featurized in the direction of games, but it could replace the netmeeting" and "photoshop" components from the previous post.
http://hem.fyristorg.com/matben/
Best of all, it's GPL'd.