A company named Leap is working on a really impressive motion tracking hardware/software package for PCs. If you’ve seen the motion tracking on the Xbox or similar game systems you might have a basic idea of the potential, but Leap has made some huge improvements to the resolution of what can be tracked. It’s tracking fingertips to sub-centimeter accuracy levels, opening up new possibilities for human-machine interaction. The cost? A mere $70, which also means that you can expect this to become ubiquitous in future PCs.
In addition to the website linked to above, here’s a cool demo by the company’s CTO: