The human eye viewed from inside, showing the iris, the ciliary body, and the edge of the pupil.
The More You Know About Microscopes
Small animals seen in the Scanning Electron Microscope - ciliates
Giantmicrobes.com has a pretty decent set of categories for their products - I like the organization. Also, they have started producing specialized human cells and small multicellular pests. Blog with educational suggestions: http://www.stemmom.org/2012/04/giant-menacing-microbes.html