The Windows XP interface has been around for a few years now and, apart from enabling some minor visual changes (such as changing your desktop background, fonts and colour scheme), you can't change too much from within Windows. Whilst Vista promises a new improved user-interface, you don't need to wait for Vista to make major visual improvements to Windows XP.
StudioTwentyEight are pioneers of visual components to improve Windows, designing and supplying themes (visual styles) for StyleXP, new icons, wallpapers and interface skins. If you want an interface based around the original Longhorn, there's a style available. If you want a Mac OS X feel to your interface, there is a theme available.
If you're a big fan of Mac OS X, the recently released FlyaKiteOSX 3.5 will enable you to change every part of your Windows interface to reflect OS X. However, why anyone would want to do this is anyone's guess. Check out FlyaKite for yourself.
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