Difference between IBM and Apple computers?

Without getting into a PC vs Apple debate; the main difference between an IBM (PC) and an Apple PC, is the operating system.

Apple computers run on Machintosh OSX (older Apples might use an earlier OS version, such as OS9) while IBM PC's will run on Microsoft Windows operating systems, such as Windows Vista, Windows XP or the latest Windows 7.

Apple computers generally are more expensive, and at the same time offer reliability. They are generally marketted to the Arts industry, such as music creators or graphic designers where as IBM PC's are generally marketted to businesses that require a robust framework on which to run their programs - most accounting software for example will only run on a Microsoft based operating system.

Microsoft based computers are generally known for their value for money, whilst comprimising quality, where as Apple computer's are generally overpriced, but providing a much better user experience.

There isn't alot of difference nowaday's anyway -- Mac's are coming down in price, and window's usability is skyrocketting with the release of Windows 7.