You should have access to a fairly recent computer (preferably no more than about 3-4 years old) that uses an up-to-date operating system, such as Windows XP or Mac OS X. You'll also need current versions of web browsers such as Firefox, Netscape Navigator, or Internet Explorer. While it's possible to use an older computer or operating system to teach online, most people who use older equipment find its speed to be unsatisfactory.
High-speed Internet access (cable, DSL, or other broadband connection, such as NAU's network), although not required, will definitely make teaching online more pleasant.
You'll need some kind of software to create your course content. Most course developers and instructors prefer to use Microsoft Word or Macromedia Dreamweaver to create their content and web pages. The e-Learning Center offers training in how to use Word and Dreamweaver to create materials for web courses.