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I have a fall 2008 unibody MBP that requires a complete logout to switch graphics cards. Anyone know if the ability to switch on the fly requires hardware or will it make its way back down to older owners via a software update?

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It's a hardware thing, so no. Surprisingly though it isn't Nvidia's Optimus switching stuff but rather some proprietary apple concoction.

I had to fact-check this because some sites (including Ars) are incorrectly reporting that Apple does use Optimus.

Here is a link from Apple Insider discussing Apple's graphics switching: http://www.appleinsider.com/articles/10/04/13/nvidia_says_ne...

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