Tech Timeline: The iPad first goes on sale

The iPad made it possible to leave your laptop at home and still stay productive. You could write emails, watch movies, and surf the web all through a 9.7-inch touch screen display. It wasn't the first tablet, but it was one of the most popular. Apple sold 300,000 units on the first day and that hit a million in the first month. The cheapest model started at $499 and came with 16 GB of memory. Yikes!