I'm wondering if maybe I shouldn't just get a new card.  It's 5 years old, but it's a good card and it works perfectly fine in XP.  But Vista, which is now dual-booted on here, doesn't like it too much either, and I'm pretty sure the problem there is the driver, too.  That's probably fixable, though.  And I'll keep working on getting the linux driver to work.  It seems a bit silly to get a new card not because I need a better GPU but because I can't get a driver for it.