If 2 million were sold within 59 days, the third million went out the door in 21 days, meaning the pace had actually picked up. Of course, the the international release introduced a huge new pool of potential customers, but that doesn't detract from how impressive these numbers are.
The release also cites "over 11,000 apps" built specifically for the iPad, which is up from the 8,500 mark as of WWDC 2010.
I'm really looking forward to the financial conference call that includes iPad and iPhone 4 numbers. Analysts are already revising their AAPL price targets upward.