Microsoft has announced it wants to simplify access to technical documentation for older Office formats, and initiate an open-source project to replicate the binary formats in Open XML.
Tools such as Linux From Scratch, NimbleX Live CD Generator, Kiwi image system, and the Ubuntu Customization Kit can help you create your own custom Linux system.
Version 3.2 of the Xen Open Source virtualization solution is now available. The new release not only adds new features, but comes with many modifications under-the-hood.