I was browsing the web for toucam stuff, (yes it seems i am that much closer to getting one) and noticed that someone had made a peltier cooled long exposure mod for the philips toucam. very interesting stuff, but way outta my league...
the tests shown on the page show a great reduction in hot pixels tho... any how heres the link
http://www.philip.davis.dsl.pipex.com/peltier_mod2.htm