I'm starting up a programming forum, and need ideas for some contest prizes. I need a few at different levels, right now I've thought something like a subscription to oreillylearning.com for a year (giving the winner access to all the books). Not sure if this would do the job in attracting visitors, and visitors to sign up - just a bit dull - and people who are posting quite a bit wouldn't necessarily find the books a whole lot more useful.
I need something that gives a bit more 'bang for buck' - can anyone think of any? What would get your toes all tingly and signup? It's going to be for a mixture of things, like posting, referring, helpful articles/blog mentions. Cash is a bit boring on itself, I will be giving out cash prizes but don't want all the prizes to me cash.