The iPad is already the second biggest part of Apple's business as measured by revenue after less than two years on the market. In the June quarter, the iPad generated $6 billion in revenue versus the Mac which generated $5 billion.
The real story for Apple continues to be the iPhone which did $13.3 billion in sales for the quarter. The iPhone and iPad are now 66% of Apple's sales, impressive considering how relatively new the products are.
Read more: http://www.businessinsider.com/chart-of-the-day-apple-revenue-by-product-2011-7#ixzz1Sjd0sgpy