About a month ago, Intel released a tool that allows Linux users to easily upgrade to the latest Intel graphics drivers. The tool comes with a repository used for the driver updates and it's available for Ubuntu (12.10 and 12.04) and Fedora (17 and 18). The repository had some multi-arch issues on Ubuntu 64bit, but they seem to have been fixed, at least according to my test.
I've tested the drivers on my laptop, under Ubuntu 12.10 64bit which previously had some multi-arch issues (which some of you have encountered as well), and the bug seems to have been fixed. I've also tested the repository in VirtualBox, under Ubuntu 12.04 64bit, however since I couldn't reproduce the multi-arch issue in 12.04 before, I'm not sure if it was fixed for Ubuntu 12.04, so use this with care and check to see if it's trying to remove any packages when upgrading. Since I can only test it on one real machine, make sure you know what you're doing when using this tool.