The NVIDIA Tegra processor architecture is based off of the ARM chip technology.  The Tegra was designed primarily for mobile, MIDs, and PDA devices.  Recently it was confirmed that the Microsoft Zune HD will be powered by the NVIDIA Tegra processor architecture.  The rumor was confirmed in a podcast on Zune Insider, hosted by Matt Akers. Listen to a clipping from the podcast below:

[audio:http://pulse2.com/wp-content/uploads/2009/06/tegra.mp3]

[via Engadget/Zune.net]