Square may see the iPad to as an excellent retail tool, but Eventbrite thinks Apple's tablet a box office boon, which is why it created the At The Door app and card reader solution. Eventbrite's a self-service ticketing platform and its new dongle, which connects via Apple's 30-pin connector, lets indie event promoters take reader-encrypted credit card payments with any iPad. Meanwhile, the app lets you see on-site and online ticket sales, keep track of customer contact info and balance the books as well. Plus, any payments taken through the app are service f
