I've mentioned Socrative in an earlier post. It's a free, web based student response system. I really like this type of quick, formative assessment. I used clickers last year, but I teach in the math computer lab so I have enough computers for everyone and it's easier to use the web based systems. Plus, there's some extra features like this Space Race. I've only used it once, but I liked it and I plan on doing it again.
I put the students in groups of two for a quick quiz on subtracting integers after they had done a worksheet on it. Each pair logs into a computer and they go to my room on Socrative. I start the quiz as a Space Race and they see this on the projector attached to my computer
As they answer questions correctly, their space ship moves across the screen. It's fun to do, I played the game myself as a student in a tech ed course this summer and it was a good time.