...for implementing the OpenGL S3TC extension!
It's one of the major reason nVidia cards can run the UT 2003 Linux demo (and, presumably, the full version once it comes out).
Oh, just in case anyone cares (
), here's a list of some mirror sites for the Linux demo (it's 90-some megs, but WELL WORTH IT):
It's also reportedly up on FilePlanet, but there's a 2-hour or so line.