Yep - for Nvidia Surround you have to run the cards in SLI (i.e. not possible on a single card).
For ATI cards on a dual card setup with Eyefinity, Crossfire is supported for full screen gaming only. For windowed gaming (i.e. multiboxing WoW) you get no benefit from the second video card, and when you're pushing around these kind of resolutions, you really want that 2nd card helping out.
And you can't just disable Crossfire and connect some of the monitors to the second card - for Eyefinity all monitors must be connected to the same video card...so pretty much Nvidia is the only way to go (currently) for this setup.
Cheers,
S
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