World's *ist: GeStream Tech's 5.9-Inch Bipedal Robot
Although Tomy's 6.5-inch i-SOBOT was only recently released, an upcoming kit from GeStream Tech is being put out for show that's a whole 0.6 inches shorter, capable of dancing, kicking ping-pong balls, and all the other activities typical for one of these Asian bipedal robots.
When it's released, the GeStream model should cost around $200 for the kit, with assembly required, of course. I can't imagine it'll be very long before these things get down into the three or four inch range, come pre-programmed with a variety of cute moves, and will become extremely popular desk toys.
Malaysia's i-SOBOT Challenger: New World's Smallest (Commercial, Bipedal) Robot? [BotJunkie]

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That's one table-humping robot.