I don't think the list should be very long, maybe 3 games at most for Wine testing. WoW shouldn't be in the test bed because that game requires a monthly fee and I don't think Michael would be interested in doing testing on a game and have to spend 15$ just to do it. (I wouldn't either in a million years)
Just remember that the tests with Wine depend on Wine more importantly than just the graphic drivers. And that I don't think Wine should be the center of attention for testing. People want it, but its NOT native (In theory it is, but thats a different story).
All of the games like UT 2004 and such are all testable in Windows as well. Just remember to use the OpenGL renderer in Windows as well to give a more accurate test, since the Windows version defaults to the Direct3d renderer.
More games will be tested, just let Phoronix do their thing. Wine is not of any importance here. Thats a different can of worms.
Just remember that the tests with Wine depend on Wine more importantly than just the graphic drivers.
That, of course, depends on the game - some Wine optimisations for 2d games have been broken with fglrx for some time now, because the fglrx driver doesn't make available the full range of OpenGL extensions that it should. That's, arguably, not Wine's fault.
Of course, you're quite right that this is outside of the remit of the kind of testing Phoronix is thinking of - this kind of full-scale testing would also require an nVidia card as a control, to isolate Wine issues from fglrx issues, and I doubt they have the time to do that many benchmarks...