University of Ohio, excellent image bank:

Worms and Germs blog, maintained by a parasitologist. Current parasitology news, updates, etc:

Companion Animal Parasite Council, veterinary resources:

American Heartworm Society:

University of Pennsylvania Parasitology Image bank:

All about C. elegans:

I have a bunch of resources that I'll post once I get back to my laptop. But these are the ones I could think of off the top of my head.