These links will tell you all you need to know about the variety of platforms available for your computing needs, from Windows and Macintosh to Linux.

Resources in this category:

Every Mac: Mac Specs, Prices, Answers and More :: http://www.everymac.com/
"EveryMac's exhaustive catalog of Macs and Mac compatibles provides complete specs and technical data. EveryMac.com provides information on everything from today's Apple Power Macs and PowerBooks to yesterday's Performas and LCs. In addition, it supplies information on the mainstream MacOS-Compatibles from Motorola, PowerComputing, and Umax, and often forgotten manufacturers such as Dynamac and Outbound, along with many others." Browse by manufacturer, processor, case type, or search.
Linux Planet :: http://www.linuxplanet.com/linuxplanet/
This site features "Linux news and tutorials for Linux system administrators."
Linux/Unix Tutorial Site :: http://www.ctssn.com/
This website offers free, practical Unix tutorials. Appropriate for people new to Unix.
Mac Teens :: http://macteens.com/
This site is the #1 destination on the web for teens who love Macs. Here you can find an active online community with message boards, galleries, news and more. The site also hosts a free e-mail service.
OSXGuide.com :: http://www.osxguide.com/
This site is dedicated to telling Mac users "how to do things in OSX." There is a bulletin board, list of OSX FAQ's, and OSX news. This site is also searchable.
The Penguin's Guide to Linux :: http://library.thinkquest.org/C003740/
This is a site designed to teach users some basics of this "revolutionary operating system." It has a variety of formats; the text-only version is available in French, English, German, and Spanish.