The two major editions are Windows XP Home Edition, designed for home users, and Windows XP Professional, designed for business and power-users. Other builds of Windows XP include those built for specialized hardware and limited-feature versions sold in Europe and select developing economies.
Windows XP Home Edition
Windows XP Professional Edition
Windows XP Media Center Edition
This edition is designed for media center PCs. Originally, it was only available bundled with one of these computers, and could not be purchased separately. In 2003 the Media Center Edition was updated as "Windows XP Media Center Edition 2003", which added additional features such as FM radio tuning. Another update was released in 2004, and again in 2005, which was the first edition available for System Builders.
Many of the features of Windows XP Media Center Edition 2005 (including screen dancers, auto playlist DJ, and high end visual screen savers) were taken from the Windows XP Plus! packages. These were originally shipped as add ons to Window XP to increase the users experience of their Windows XP machine.
Windows XP Tablet PC Edition
Intended for specially designed notebook/laptop computers called tablet PCs, the Tablet PC Edition is compatible with a pen-sensitive screen, supporting handwritten notes and
portrait-oriented screens. It cannot be purchased separately from a Tablet PC without an MSDN (Microsoft Developers Network) subscription.
www.microsoft.com/windows/products/windowsxp/default.mspx