> I remember that Nickelodeon had a contest where the winner was given a videophone and was part of some gameshow. I suspect it ran on ISDN.

I won a copy of Sonic the Hedgehog in that contest! AFAIK, it was just a retail copy and a letter; the game might still be at my parents' house, but I certainly don't have the letter. I was not selected to be on the show or anything. I remember watching the scrolling rules when they were doing the promotion and writing down a couple bits of the address every time.