Piper Jaffrey tech analyst Gene Munster yesterday revised his initial single-day sales predictions for Apple’s iPad by as much as 250%. Prior to the iPads launch, Munster had expected Apple to sell 200,000 to 300,000 units (including pre-orders) within the first 24 hours. But after a bit more research and watching some 730 people flowing in and out of Apple’s 5th Avenue shop in New York City, Munster revised his estimate to a whopping 600,000 to 700,000 units sold. To put this into perspective, the iPhone 3G saw 530 people visit the same location while the launch of the iPhone 3GS saw 350. The launch of the original iPhone saw Apple move some 270,000 devices in a single day. Perhaps Apple can indeed move 7.1 million iPads in a year as iSuppli predicted just two days ago.