Share your online presentation using Screencasting tools. Capture your screen time (demonstrate software, show how to find something on the Web) then create a YouTube video.
Jing
Jing is free software you can use to make a narrated video (if you have a microphone) showing how to do something on a computer. It records your mouse, and everything you click on and show on your screen. You can upload to their website and then embed video into your presenation or just link the the website.
CamStudio
Free. Captures your screen and creates AVI movie.
Design Better with CRAP: Discusses the importance of Contrast, Repetition, Alignment, & Proximity in creating a strong, easy to interpret design.