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As for Linux support, er, my G400 worked out of the box with Xinerama but with a Parhelia, I have no idea.

I looked into this a while ago, and support for multi-DVI cards, even dual-DVI, under Linux is a bit hard to come by, especially if you don't fancy proprietary, binary kernel drivers. As you probably don't care too much about 3D performance, I'd just find a well-supported single-DVI PCI card and buy four of them (or three and one AGP, or whatever). X ought to just deal with it.

Or just abandon the idea of DVI -- if the 2405FPW is anything like the 2001FP, it'll lock absolutely pixel-solid to a good analogue VGA signal. (Plenty of dual-VGA cards are well-supported.) Especially as a wall display, no-one will probably ever notice it's not digital.

Peter