For those that use Windows, yet lust after a Mac and can't afford or justify the purchase of one, you can make your Windows XP PC look as much like a Mac as possible.

Follow the instructions at Tech Manifesto, or simply download FlyakiteOSX and let it do all the heavy lifting for you. Be warned that the install for FlyakiteOSX takes quite a bit longer than you might imagine. But it's still faster (or at least more efficient) than doing the transformation manually.