No, it's not from anybody you've heard of.
Despite rumors indicating that the Nintendo 3DS would be powered by an Nvidia Tegra chip, a press release has revealed that the system's graphics chip is in fact the PICA200 chip produced by Japanese hardware company Digital Media Professionals.
The chip's clock speed is 200MHz, and it can push 15.3 million polygons and 800 million pixels per second. It also features alpha-blending and full-scene antialiasing at a low level of power consumption, and employs the company's proprietary "Maestro" 3D graphics technology.
Here's a demo reel of the chip in action.
Thanks to BlackNMild2K1 and Greybrick for the news tips!