Synthasite offers $1.000 plus press coverage
And all you have to do is use their free webpage editor, which rocks anyways. All pages made with synthasite are eligible for the competition, the results will be presented to the public on January 5th next year. But there's actually a lot more than just plain old money at stake: especially pro-bloggers dig all kinds of buzz for their persona/projects, so this sounds like a nice deal:
Winners will receive (a) a free SEO lesson, performed by SynthaSite CEO and SEO Expert Vinny Lingham, (b) $1000, (c) be featured in a SynthaSite press release, in the SynthaSite newsletter and posted to Vinny