Wired Science has an incredible gallery of the Best Microscope Videos of 2012, via Nikon’s video competition. We have a few favorites: This is a Bay Scallop Argopecten irradians. (Those blue things are tiny eyes.) And here’s a beating heart display of a Danio rerio (zebrafish).
The above video shows a Limnias melicerta (a rotifer) at 200x:
This microanimal lives in a self-built tube attached to waterplants. We see the rotifer using fast moving cilia to create a vortex. This enables it to sweep in food particles like algae. Inside the organism we can also see a jaw-like structures that grind the food.