There are a few types of robots you can get as a consumer. Willow Garage has a few offerings:
PR2 – a one-armed robot powered by ROS (Robot Operating System). You can watch a few videos of what it can do here, like play pool, fetch beer, clean up empty cans.
Turtle Bot – a small robot also powered by ROS. It can explore your house on its own, build 3D pictures, bring you food, and more. You can get a complete kit for $1,399.00 to build your own or $1,995.00 built for you from I Heart Engineering. You can also get it fully built for $1599.00 or the kit for $999.00 from Clearpath Robotics (not everything is included and it is currently sold out.)