Sega is marking Sonic the Hedgehog's twentieth anniversary in a big way at its E3 booth in South Hall with a special Sonic Generations enclosure that includes a small Sonic museum of memorabilia, products, and miscellaneous stuff that the marketing machine has produced since 1991.  It's interesting stuff and definitely worth a look.  If you can't make it to the Los Angeles Convention Center today (or, later, if the booth no longer exists), then you'll have to live vicariously via these photos I snapped.