I don't know who is currently, but I do remember players from not too long ago. Darrell Green in his prime, maybe a little more then ten years ago(he only retired a couple seasons back), was the fastest thing on the field. Vick is bigger, stronger, & maybe even quicker. Green could of beat him down the line, but not much else except cover him on an option play. Another player that comes to mind more recently is Az Hakim. Not now though, when he first came up. He was the fastest offensive player I saw out there. He had such a burst. Got banged up too easily, & that's that.