I can't seem to force Anti Aliasing with PSOBB using Nvidia Control Panel.

I add psobb.exe to the program list and change settings and I don't notice any difference. The only thing I care about is AA and anisotropic filtering.

Is there a limit to what settings I should use? What have people had success with? Please share.

I have has success with just about everything, but i use an ATI card
http://img514.imageshack.us/img514/1734/optionswm.png

I'm sure nvidia user will be able to help you out.

Some drivers i have used also made pso not use AA for some reason, so in order to keep this level of quality i have to use old drivers, maybe it's a similar issue with you, maybe a specific driver doesn't let you enable AA on pso, don't really know.

Hmm...