I wrote a program that tracks player finishes in Party Poker's multitable tournaments. It's been running for about a week, and in that time I've logged about 130,000 players in 1100 or so tournraments. Any ideas on how many games I need to record per player to get a somewhat accurate ranking?
You can check out the current list here:

http://www.pokerdbase.com

It is updated about ever half hour.