#4 Ben Rothlisberger
Video from YouTube via the NFL.
Big Ben saves the Steelers from a Jerome Bettis fumble recovery disaster. With the game on the line against the Colts, Nick Harper recovers a goal line fumble and rumbles down field, with just Rothlisberger to beat. That is when Big Ben twists and turns to make a shoe string tackle.
The tackle makes the list, not only because of the athleticism but the amazing effort put forth by Rothlisberger.