Well, open your Display Properties and then go to Settings->Advanced…->GeForce4 Ti 4200->Performance & Quality Settings
Huh? 
Those running the nVidia supplied binary driver under linux will set two envrionment variables…
Full Scene Antialiasing settings
variable __GL_FSAA_MODE
FSAA 1 is 2x Bilinear Multisampling
FSAA 2 is 2x Quincunx Multisampling
FSAA 3 is disabled
FSAA 4 is 4x Bilinear Multisampling
FSAA 5 is 4x Gaussian Multisampling
Anisotropic Filtering settings
variable __GL_DEFAULT_LOG_ANISO
AF 0 is disabled
AF 1 is low Anisotropic Filtering
AF 2 is med Anisotropic Filtering
AF 3 is max Anisotropic Filtering
This is GF4/FX specific, if you have GF2/3/Quadro4 you’ll need to look it up.
Set these somewhere, maybe in your bashrc, and all of X gets purty:
export __GL_FSAA_MODE=5
export __GL_DEFAULT_LOG_ANISO=3