Apple has sent out an email to customers urging them to line up to buy the iPad 2 on Friday. “Be the first to get the next iPad,” reads the email. “The Apple Store is the best place to experience iPad. Our Specialists will show you around the features, help you choose the perfect model, and set everything up just the way you like. So you’ll be up and running before you leave the store.” Below the text is a link to Apple’s…