MetaFilter crossed the 100,000 user mark, and we raffled off that exact user ID for charity. Here's the thread that launched the raffle and the total raised is below.
Here is video of the drawing held on November 20, 2009:
And the winner is... jamaro. The full details are here: 100K raffle is over! Congrats to jamaro!
Total donors: 514
Total donations: $12,745
Thanks to everyone who contributed, below is a screenshot showing all completed donations to the appropriate agencies (Doctors w/o Borders only accepted credit cards and the Paypal card had a $3,000 daily limit, requiring three transactions over three days to complete).