I use CubePoints inside WP Symposium to create a little friendly competition between my members. I have set-up the ranks or levels of achievement using the characters from the movie "Monty Python and the Holy Grail". When once completed, someone will win a prize. It's great fun every time a member moves up in rank. It would be nice to see icons to represent each rank/level achieved, but other than that it's an excellent plugin.