The Ivy Bridge Linux graphics support is in terrific shape for being enabled open-source hardware support at launch. Other areas of the processor are also well supported already by Linux and open-source software, such as with the latest LLVM/Clang and GCC compilers already supporting Ivy Bridge and its new instructions and random hardware number generator. Ivy Bridge is really great on Linux.
Ivy Bridge brings improved Intel HD graphics with support for Microsoft DirectX 11, OpenCL 1.1, and OpenGL 3.1. The OpenGL 3.1 support for Intel Ivy Bridge processors under Linux with their Mesa DRI driver is still a work-in-progress, the earliest we will see this stable is the Mesa 8.1 release this summer. With the current stable release, Mesa 8.0 (what's found in Ubuntu 12.04 LTS and other new distributions) is GLSL 1.30 / OpenGL 3.0 compliance for Sandy Bridge and Ivy Bridge graphics. Ivy Bridge can also handle HDMI 1.4a and drive three independent displays simultaneously, another feature that's already supported by the open-source Intel Linux graphics driver. When paired with an Intel 7-Series "Panther Point" chipset there is also PCI Express 3.0 support, integrated USB 3.0, and other new capabilities. Under Linux right now for the Ivy Bridge graphics there is no OpenCL support, but they seem to be working on OpenCL support. For the CPU side, Intel makes a closed-source Intel OpenCL SDK that does work under Linux.
You'll probably need to run F17 and maybe include some koji work for a few months, but it the sort of hardware I'd be looking for.
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In the personal opinion category;
Intel has for some time done a really nice job of supporting the open source community.
wifi drivers, net chip drives, early cpu features exposure and GPU drivers and documentation. AMD has good wrt their CPU info, but ADM/ATI has been pretty bad about helping us out with GPUs. Nvidia a good notch better but still quite spotty.
So if your want Linux and graphics needs are modest - Intel is a great choice. Their GPU performance & features are improving rapidly too. If you need good to great graphics performance I'd be strongly inclined to use nvidia. The open-source nouveau is OK and the proprietary drives mostly work well at the cost of an install. ATI has fallen off my radar. It can be made to work - but I don't need those sorts of headaches in my life.