I recently found the online portfolio site of animation storyboard artist Sahin Ersoz. His samples from THE SPECTACULAR SPIDER-MAN animated show are some of the best action storyboards I have ever seen.
These drawings are so full of action, depth and dynamic posing, they're a real inspiration!
I love how loose the drawings are, while still having such strong construction and weight.
The best part about his website is that you can watch the storyboards in a little movie player. When there in sequence, they look like they're practically animated already!
These boards pass the toughest test, which is that you can watch and read the whole story without any words, dialog or scene description notes. Fantastic stuff!