I don't have any actual expertice, but I'll just say that those are hard to build, but tons of fun to see in action.
I have done some programming for something I constructed out of LEGO Mindstorms once, so I might be able to offer some advice if you have something specific. Feel free to PM me, the worst that could happen is I don't know and have to yell at you cover my lack of knowledge.
P.S. Mindstorms is great. Check out my avatar for some of the cool things you can do. And I got it to Mars with less than those NASA guys.

