"The old idea where Microsoft bases an operating system on central pillars? It’s back, and with a complete refocus of priorities. Looking back, the original pillars of Longhorn were Avalon (WPF), Indigo (WCF), and WinFS, as well as the pseudo-pillar which was referred to as “Fundamentals.” No longer does Microsoft’s basis for an operating system focus on key architectural developments such as the various frameworks of yore. Now, it seems, pillars are at least tentatively being redefined as design and usability concepts upon which to build the operating system. Over the next five days, I’m going to spend some time on AeroXP presenting to you the separate pillars upon which the Windows 7 experience (and indeed, Windows 7 as a whole) will be built. What you'll see are the five pillars of Windows 7 and the specific scenarios which the Windows team plans to enhance. Wherever possible, I'll enhance the scenario depictions with visual aids (read: screenshots). The first pillar is after the jump."
This looks to be an interesting series for those who would like to see the high-level, basic concepts that go into designing an operating system, specifically Windows 7. It is also a good look at some of the changes we can expect to see a few years down the line.