According to a recent article in New Scientist online games are solving uncomputable problems
Using the distributed skills base of online gaming enthusiasts scientists (with the help of the general public) are able to find out things which has been beyond their reach including more ideas about how proteins can be folded, and about spiral galaxies. You may want to profile some of these games in your libraries as a way of stretching people's understanding about online gaming.
I am just starting some research into the possible and actual use of gaming methodology for reference and information services. There would seem to be some really useful areas around expanding research skills as well as in other areas.
If you have never tried online gaming check out one of the games mentioned at the end of the New scientist article.