Information Week has an interesting article:
The Next Windows After Vista Will Demand Radical Rethinking From Microsoft
"Microsoft is at a crossroads, and the operating system that follows Vista will likely mark a serious break from the past. That is, if Microsoft can figure out how to do things differently.
While it's putting the finishing touches on Vista--a near-final test version could arrive this week--Microsoft is at work on the next major version of its most important product, a system code-named Vienna that's supposed to introduce a whole- sale reworking of the Windows desktop. Before that, a tune-up of Vista, dubbed Fiji, is in the works.
Windows Vista The next version of Microsoft's operating system will include a new user interface that automatically sorts related files into folders, an improved search engine, and more powerful graphics technology. Windows Fiji An interim release of Windows after Vista, this tune-up may include bug fixes and new features Windows Vienna after Vista is likely to include a revamped desktop and the ability to wall off old code from critical parts of the system and deliver features over the Web..."