Multitouch is just as useful on a desktop as it is on a phone or tablet, so I’m delighted that the first cut of Canonical’s UTouch framework has landed in Maverick and will be there for its release on 10.10.10.
You’ll need 4-finger touch or better to get the most out of it, and we’re currently targeting the Dell XT2 as a development environment so the lucky folks with that machine will get the best results today. By release, we expect you’ll be able to use it with a range of devices from major manufacturers, and with addons like Apple’s Magic Trackpad.
The design team has lead the way, developing a “touch language” which goes beyond the work that we’ve seen elsewhere. Rather than single, magic gestures, we’re making it possible for basic gestures to be chained, or composed, into more sophisticated “sentences”. The basic gestures, or primitives, are like individual verbs, and stringing them together allows for richer interactions. It’s not quite the difference between banging rocks together and conducting a symphony orchestra, but it feels like a good step in the right direction 
The new underlying code is published on Launchpad under the GPLv3 and LGPLv3, and of course there are quite a lot of modules for things like X and Gtk which may be under licenses preferred by those projects. There’s a PPA if you’re interested in tracking the cutting edge, or just branch / push/ merge on LP if you want to make it better. Details in the official developer announcement. The bits depend on Peter Hutterer’s recently published update to the X input protocols related to multi-touch, and add gesture processing and gesture event delivery. I’d like to thank Duncan McGreggor for his leadership of the team which implemented this design, and of course all the folks who have worked on it so far: Henrik Rydberg, Rafi Rubin, Chase Douglas, Stephen Webb at the heart of it, and many others who have expanded on their efforts.
In Maverick, quite a few Gtk applications will support gesture-based scrolling. We’ll enhance Evince to show some of the richer interactions that developers might want to add to their apps. Window management will be gesture-enabled in Unity, so 10.10 Netbook Edition users with touch screens or multi-touch pads will have sophisticated window management at their fingertips. Install Unity on your desktop for a taste of it, just apt-get install ubuntu-netbook and choose the appropriate session at login.
The roadmap beyond 10.10 will flesh out the app developer API and provide system services related to gesture processing and touch. It would be awesome to have touch-aware versions of all the major apps – browser, email, file management, chat, photo management and media playback – for 11.04, but that depends on you! So if you are interested in this, let’s work up some branches 
Here’s the official Canonical blog post, too.