Sometimes you need to set the BIOS to the correct AGP level first.
As far as anti-aliasing, it should be pretty simple to set up if you're using XFree86 4.0.3 or later (run
xdpyinfo | grep RENDER
to see if it's supported - if the output is RENDER then the answer is, of course yes
. If you're using KDE, it may even be as simple as ticking the box under the Control centre -> Look & Feel -> Fonts, and restarting KDE.