Apple announced that they have already sold 2 million copies of Leopard since releasing Mac OS X Leopard on Friday.
Leopard has been far more successful in its first weekend than OS X Tiger has been.
"Early indications are that Leopard will be a huge hit with customers," said Steve Jobs, Apple’s CEO. “Leopard’s innovative features are getting great reviews and making more people than ever think about switching to the Mac."
Via the Apple site. Leopard still sells on Amazon.com for a low $109.