Since its launch in 2010 the iPad has only ever featured a single dock connector, despite being used frequently in landscape orientation. There were, just before launch, rumors that the device might have two connectors—and now a prototype which has just sold on eBay further suggests that such plans were considered.
This prototype 16 GB original iPad is plastered in prototype identification numbers and, while it's always difficult to say for certain if such items are real, the accompanying documentation and images certainly make it appear to be a genuine Apple prototype. Certainly, one person was convinced enough to spend $10,200 to secure the item.
It does raise the question as to whether two dock connectors might have been a good idea. It would, of course, have taken up more internal space, and looked ugly and asymmetric—but would the extra convenience have been worth it? More here.