Nvidia has announced the introduction of a new line of processors that they are aiming towards integrated devices. So-called "System on a Chip" units, under various names, offer an easier way to get lots of functionality in a small space. Nvidia's APX 2500 "Application Processor" will be designed to process high-definition video in very small environments, particularly mobiles like smartphones and PDAs.
The unit is capable of playing back 720p content and relies on a heavily modified GeForce core that uses very little power, claiming 10 hours of HD video playback, though that of course all depends on the device as a whole that it goes into. Nvidia mentions strong ties with Microsoft in development of the APX 2500, meaning it is likely it'll be centered around the Windows Mobile platform as well. You can read more in the full press release.