There has been some talk of changing the schools micromouse competitions. I am in favour of a more flexible line-following class of competitions. While doing a bit of research, I found many examples of the kind of thing I had in mind. Given that these competitions are much more popular in South East Asia, I was not surprised to find that most of the information and examples were to be found in Japan. What I was surprised to find was just how well advanced the state of the art is over there. Have a look at this video of a contestant to see what kind of performance might be possible: High Speed Line Follower (it takes a little while to appear in your browser). Sorry, I have no details about who this is but I believe it was taken at the 2007 Japan micromouse event.