A fantastic KPC contest, with a FAAAAAAABulous prize!
The 500,000th hit on this site will receive a free, collectible "Munger for Governor!" t-shirt from the 2008 campaign.
So go out there and click like crazy! The current count is in the red box, on the right side, about two screens down.
(Winner has to REALIZE s/he has won, and send me an email with her/his snail mail address, to qualify)
UPDATE: A commenter points to this. Nice.
Also, another commenter notes that the "counter" does not update. Yes, there is a pretty long lag. But all hits are recorded at the Sitemeter website, and so I will have the IP address of the BIG WINNER. All we need is for the winner to send me the physical address, and I'll check to see that the IPs match.
Plus, let's open this up. ANYONE who comes in between 499,997 and 500,003 is a winner. Just check sitemeter to see if you are in the lucky interval, and then claim your FAAABULOUS prize! As the xkcd folks note, the 500,000th person, or any specific number, will likely be some schlep looking for a graphic on "Google Images," and will never even know that s/he qualified!
UPDATE 2: Only about 500 hits away from that FAAABULOUS PRIZE! Just check at Sitemeter