Check this out:
ibotnow.com/
The iBot has been invented a while ago by Dean Kamen, the founder of FIRST Robotics and DEKA company. Kamen also invented the popular Segway.
en.wikipedia.org/wiki/Dean_Kamen
You are right, self balancer robots (with complex computer-controlled gyroscopic stabilization and control system) are very cool. We will probably see more of them in the future.
He enjoys inventing. Here is is with his water regenerator:
geekologie.com/2008/04/segway_inventor_makes_water_re.php
“Kamen estimates the units will cost between $1,000 - $2,000 when they go into production and anxiously wants to get them into areas around the world with poor water quality.”