[rossmum]

If you can't get AA to work but you can crank up your resolution without too much of a performance hit, take a screenshot at about twice the res you want and then resize it. I learned this trick back when I used to mod Halo, as it didn't support AA at all.

Failing that, going around the edge pixels with a 1px smudge brush at about 80-90% strength in Photoshop works pretty well, too.