I've got my Cybot running around controlled via PHP, with an LCD screen hanging off the back displaying current CPU temp and clock (No pic yet).
I plan to add the line follower, distance sensors and impliment an awareness of it's surroundings so it can be told where to go, for instance a charging dock (automatically when batteries start running down).
But using PHP it has been controlled by friends with port forwarding on the router, just needs a webcam on it and anyone can have a go
Find me on Twitter - @Boeeerb
Website - http://www.boeeerb.co.uk