I've recently been working with Sameer Bhatia the CEO of ProProfs as I was going through an evaluation of various online tools that support easy, fast, low-cost testing and quiz tools (disclosure). He helped me pull together the following evaluation of a few different solutions.
Microsoft Powerpoint is an immensely powerful suite, and can be used for much more than straightforward presentations. It can be used to create website mockups, and even interactive learning tools.