At the moment Apple cannot or will not say to the people working in the Apple Stores. At the end of the financial quarter Apple may release that information, but, if you walk past any of the stores and notice how many people now own an iPad then the just-between-you-and-me answer is truck loads.
3 in total
25 million ipads were sold in the first month
About 100 million iPads have been sold as of August 2012.
Over 100 million have been sold worldwide as of July 2012.
About 20,000 iPads are sold every day in the US.
No one knows how many iPads will be made now and in the future. It will depend on when Apple decides to stop making them, and how many are sold. As of now, about 100 million have be sold worldwide (Fall 2012).
Apple sold 600-700 thousand
18000
As of September 2012, approximately 100 million iPads have been sold.
Apple sold more than 15 million first-generation iPads within the first year of production. It is known that 300,000 iPads were sold on their first day of availability.
Apple reported that 3 million were sold that weekend.
They are already on sale. They have been sold since 2010. The fourth generation is expected the 2nd week of November.