Several people have written in pointing out the release of the new UT2003 Linux Patch, version 2166. The very long changelog can be read in full, if you desire, here
[update by Matt]
According to this post on the DRI mailing lists, this patch allows UT2k3 to run without S3TC, and thus DRI-enabled cards may now have a chance to play. I haven’t had an opportunity to test it, but perhaps some of our readers could try it out.
Mirrors: 3D Downloads