I know i've posted about temporal AA already but here's a nice program to do it for you give it a try
Radlinker 1.08
http://www28.brinkster.com/chrisww1942/
If you havent used radlinker before what it does is allow you to create shortcuts to games but with the extra benefit of being able to set overclocking, Anti Aliasing & Anistrophic Filtering levels, vsync on or off and other settings customised for each game
It now includes temporal AA settings for Direct X games only though
Temporal AA is supposed to create the illusion of your videocard running at a higher Antialiasing level than it actually is running at.
So 2xtemporal AA will look like 4xAA but with the performance hit of 2xAA
4xtemporal AA looks like 6xAA but with 4xAA hit in performance e.t.c.
Try it if you havent already.