Not that I know of. I can't get AA to work either,
but at least I can use the Rage3d tweaker to correct the
corrupted texture problem and I can play the game at
1600x1200x32 without a hitch and the image quality
is the best I've ever seen on any graphics card, in
spite of the lack of AA or AF. What's weird is that
Deus Ex, which uses the same engine as UT, will
allow AA to work with the latest multiplayer patch.
So, I'm guessing that Epic games never did release
an optimized D3D driver for UT, while Ion Storm did
for Deus Ex, but I could be wrong.
BTW, I use a 9700Pro. but, I wouldn't mind testing
out a 9800Pro 256MB memory version once it comes
out.