Matt Reichert showed off his collection of prototypes and Arcadia 2001 stuff. The picture on the left shows Matt's copy of Funky Fish, a rare Arcadia 2001 game that he nabbed from New Zealand, and also the "Intelligent Game" (Europe/South Asia, circa 1982) and "Leisure Vision" (Canada) incarnations of the system.
Matt (a.k.a. "Tempest" on certain retro message boards) also has a prototype multi-cart for the Arcadia 2001 (sent to Matt by designer Ward Shrake), currently with 8 games on it. He also showed off a bunch of Atari 5200/2600 prototypes and loaner carts.