I know this stack exchange provides the ability to post photographs of animals/plants for species identification, but is there a web resource that can automatically identify a plant/animal using image processing/correlation tools - so the user doesn't have to painstakingly work with keys?
I'm going to go out on a limb and say NO. I'm a professional biologist developing a natural history website, and I've never encountered such a thing.
Scientists are only beginning to develop robust techniques using DNA markers and NIR spectroscopy, for instance. For automated systems based on photographs there are some tests too, but usually restricted to very narrow taxonomic groups.