Of these, only NVIDIA and ATI have made an effort to build 64-bit editions of their drivers (the ATI driver is currently in beta testing).I guess this is a nitpick, but I think the inclusion of OpenGL drivers in this paragraph about 32-bit compatibility is misleading for a few reasons. First of all, I think that Nvidia has done more than "made an effort" to provide an x86-64 version of their driver; the driver is quite fast, fully-featured (wrt the x86 version), and very stable. Second, you can't use x86 kernel modules with an x86-64 kernel anyway, so there's no compatibility option for drivers as there is for the applications that are mentioned.
Anyway, just wanted readers to know that if you're concerned about switching to x86-64 because of the quality of Nvidia's OpenGL driver, you shouldn't be. You can even run x86 OpenGL apps with full hardware acceleration; the Nvidia x86-64 driver supports the 32-bit x86 ioctls.
I can't speak for ATI's driver, as I haven't used it.
And sorry, one last nitpick -- this article should be titled, "Some Thoughts on the Current State of GNU/Linux on x86-64." There are lots of other 64-bit architectures supported by GNU/Linux that aren't covered by this article.
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