Videos are becoming more and more popular with internet marketers (and marketers in general). The benefits of a PowerPoint video include the fact that you can present your proposition to a prospect without being there in person. Many Internet Marketing courses are now done through recorded PowerPoint presentations.

Tools like Camtasia provide built in functionality for PowerPoint recordings. There are some free tools out there as well but i prefer Camtasia (it costs a few dollars).

Hope this helps.

Pieter