A simpler bet might be to utilize the Intrade.net system for user created contracts. Intrade.net is just for fun, but it uses the same DB and software as Intrade.com and if there is sufficient interest in the user created Intrade.net contract, it may be picked up by the main site.
Not guaranteed press by any means, but it’s free (I think) and unless you try to bid up the contract yourselves (like McCain’s camp did at the 11th hour during the election) there isn’t much risk involved. (Unlike editing your own Wikipedia article.)
