Flutterby™! :

Lego Mindstorms are going to be the toy of the season. Random URLs:

http://www.crynwr.com/lego-robotics/

http://www.enteract.com/~dbaum/lego/nqc/index.html

http://graphics.stanford.edu/~kekoa/rcx/ has information on the op codes and links to a C-like compiler.

http://www.magicnet.net/~twdow/mindstorms.html