Digital board games are going to be big. If you have any doubt, just check out Scrabble on the iPad. But to get the most out of digital board games, I think we’re going to need a third orientation mode in addition to portrait and landscape: head-to-head, or simply flat.
Of course, you don’t have to wait for devices or operating systems to support a third orientation mode. As long as you have access to the accelerometer, you can program head-to-head mode yourself. Below is an example of why a "flat" orientation makes sense (as well as a demo of iReverse running on a Lenovo X201 multi-touch laptop).