Here’s some interesting stats on social gaming and virtual goods. TechCrunch has a post about a company called Zynga (as of October 20th, 2009):
50 million daily active users as of yesterday (across Zynga games).
Farmville 20 million active users alone.
800,000 virtual tractors sold.
$830,00 worth of virtual special sweet potato seeds in Farmville in 2 weeks – half of that has gone to school children in Haiti.