Digging for low cost tools to allow more people in our company to generate better visualization led me to the following tools:
NVU – A Dreamweaver like open source software application
Inkscape – Vector Graphics Tool, also open source, similar to Illustrator
Gimp – graphic editing similar to a photoshop like app (already a Gimp user….)
And in a somewhat unrelated discovery, check out the Visible Human Server for "slices" of the human body. Awesome for science class!