Prompted by the discovery that the old UT2003 logo replacement (swap the nvidia one to an ATI one or whatever) doesn't work in UT2004, I cranked up unrealed and built a new file
Download (3.48MB)
Download (3.48MB) - UT2003HQ Mirror
Installation: Just rename or delete the NvidiaLogo_T.utx in the UT2004/textures directory and copy the new file in from this archive.
Thanks to Magic-Sim's guide at http://www.3dfxspirit.com/ for making this possible