Over 300,000 iPads were sold in the United States on Saturday April 3rd according to a written statement released by the company today.

Apple CEO Steve Jobs also noted that iPad users, on average, downloaded more than three apps and close to one book within hours of unpacking their new iPad.

According to the results of a survey of 448 iPad buyers issued early Monday by Piper Jaffray's Gene Munster, the $499 16GB iPad was the most popular (39%) followed by the 32 GB (32%) and 64GB (28%).

In a report issued to its his clients, Munster estimates that by the end of Sunday, Apple may have sold as many as 700,000 iPads.

At a minimum of $500 per device, it means Apple earned may have earned as much as $350 or $400 million dollars in iPad revenue during the first weekend.

Early reviews of the iPad from popular tech writers have been overwhelmingly positive and the number of complaints have been few. The few problems reported seem to have revolved around the inability of some users to charge their iPad through their computers. In a support posting , Apple says the problem results from the inability of some USB 2.0 ports and accessories to provide enough power to charge iPad. To solve the problem, Apple recommends users charge the device with the cable and power adaptor which comes with the iPad.

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