I have posted some amazing images on my blog that come from the NikonSmallWorld site. They host an annual photomicrography competition of photos taken with the aid of a light microscope. Every day they post an image of the day. This link takes you to the gallery.
This image below is a "Brainbow" transgenic mouse hippocampus taken by Dr. Tamily Weissman at Harvard University in 2008.
The image below is a "Brainbow" mouse brain stem with auditory pathway axons taken by Dr. Jean Livet from Institut de la Vision in 2008.
The image below is of the wing scales of Urania riphaeus (Sunset moth), taken by Charles Krebs of Charles Krebs Photography in 2008.
Below are Discus fish scales, taken by Dr. Havi Sarfaty from the Israel Veterinary Association in 2009.
This next one is a flow pattern in draining soap film, taken by Dr. Tsutomu Seimiya at Tokyo Metropolitan University in 2009.
There are many more astonishing photos; go take a look!