I recently learned that Java 1.5 has a command line switch to force antialiasing of fonts:
-Dswing.aatext=true

I tried it with FreeMind 0.7.1 on Win2K and it worked very well. It's especially nice to have antialiased fonts in edit boxes. This switch seems to override FreeMind's antialias setting for fonts, but not for edges. I think this switch should be on by default, or at least prominently mentioned in help files.