A a PhD student at the Wearable Computer Lab at the University of South Australia has added support for multi-touch cursors in the X Server system. This means you can use multiple fingers (like Apple's iPhone, or Microsoft's Multi-touch table) to navigate through your Linux desktop.

From the site:

MPX devices are independent. Each cursor is a true system cursor and different pointers can operate in multiple applications simultaneously. This allows for two-handed interaction and/or collaboration on a single display. MPX is compatible to legacy applications such as the GIMP, the Firefox web browser and numerous other applications. Keyboards provide multiple keyboard foci. So you can actually type into several applications at once. Both mice and keyboards can be hot-plugged.

Here's the cool video. Full article at http://www.ehomeupgrade.com/entry/4072/microsoft_surface_watch