Microsoft's Surface is estimated to cost \$10K in its first incarnation. I've already had an interesting conversation with an entrepreneur friend who has an application that he thinks would be fantastic on Surface, but \$10K for the hardware makes it a non-starter. Although I'm sure Surface will eventually cost less, I'll be talking to my friend about \<a href="http://wearables.unisa.edu.au/mpx/"" target="_blank" rel="noopener noreferrer">Multi-Pointer X Server, which has just added multi-touch support. Heck, might be my first commercial Mono project...