Takes you through the process of dissection step-by-step--good pics of a recently killed specimen. http://educatus.com/main/samples/default.asp?lid=801486&scid=8014860001
Good diagrams, especially if you scroll toward the bottom. http://kentsimmons.uwinnipeg.ca/16cm05/16labman05/lb8pg3.htm
Kenyon College's rat dissection website--great to review function. http://biology.kenyon.edu/courses/biol09/Rat/welcome.htm
Good detail on organ systems. http://www.umanitoba.ca/faculties/science/biological_sciences/lab16/
From the same source as the one above. http://www.umanitoba.ca/faculties/science/biological_sciences/lab15/
The mighty E-Rat! http://www.biolsci.monash.edu.au/undergrad/erat/index.html