* Mind mapping activity: http://lists.laptop.org/pipermail/olpc-sur/2008-November/001173.html
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* Make the Sugar shell react to changes in the ~/Activities dir using inotify.
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* A quiz game with competitive collaboration (cjb) -- e.g. generate arithmetic problems, have a shared countdown, and then the first person to answer correctly gets the most points. Generalizable to quizes about non-math stuff too.
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* A simple searching game: "hot/cold" where the XO is hiding somewhere on the screen (not displayed) and as the cursor moves closer or farther from the XO, the computer responds warmer/colder or hot/cold.