I"ve said it before and will say it again, for those of you who have not seen Microsofts latest Operating system: Windows XP, Chip.de has put up a great slideshow (that doesnt really do justice for the GUI as the pics are scaled down) that feature the new Luna UI and enhancements new to Windows, there are 48 screenshots in all.
Windows XP combines the earlier 9x codebase with the more stable NT kernel to bring amazing stability for home users like none other released before it. Windows XP comes in 2 flavours, Professional, targetted for business and Home Edition obviously targetted for the Home user. You can find more information on Windows XP and compatible OEM resellers here @ Microsoft.