Apple announced that it has sold over 2 million iPads in under 60 days since the initial USA launch on April 3, 2010. The 1 million milestone was met on May 3, 2010, 28 days since the original launch date.
"Apple today announced that iPad sales have topped two million in less than 60 days since its launch on April 3. Apple began shipping iPad in Australia, Canada, France, Germany, Italy, Japan, Spain, Switzerland and the UK this past weekend. iPad will be available in nine more countries in July and additional countries later this year."
By comparison, Apple sold two million iPod units in under two years from the iPod original launch date and took four months to sell two million iPhone units.
I didn't see these two in line...