Here's the solution that I use:  I render the image at much higher resolution
than I intend to use, with antialiasing turned OFF.  Then I open it in a paint
program that handles transparancy (I use Paint Shop Pro 5).  Next, I remove the
background color, then resize the image down to the size I want.  PSP does a
good job resampling, so you get the effect of antialiasing but the edges
antialias to the alpha channel instead of to black.

-Nathan

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