Nathan Bransford, a literary agent who keeps a rather nice blog of the industry, is hosting a contest. It's the Surprisingly Essential First Page Challenge. He's inviting writers to post the first 500 words of their ms and the winner gets a snazzy choice in prizes (such as a query critique or partial critique).
The contest is only open until 5:00 pm PST Wednesday, so spruce up this first 500 and head over to his blog. Warning, lots of entries already, so load time is a bit laggy.