Dell community member awards
Why not have a vote once a year on the different Dell community site, where they select users for different awards. Things like: Most helpful, funniest ect.. Dell could send the winners some kind of prize and add a special avitar to their user name or something. It would give some recognition to the people that spend alot of time on your sites and encourage others to participate more often.
Any member of the Dell Community can nominate someone for Dell Community spotlight at www.dell.com/community.