I like the guys assessment of "lb for lb speed" based on how far the boxers speed exceeds the expected avergage of his division, because obviously the lighter the boxer the faster speed possible and in absolute terms the featherweights would always be top.

So given this, special speed can be given at a glance to...

Manny Pacquiao
Amir Khan
Roy Jones Jnr.
David Haye
Eddie Chambers
Chris Byrd

And others of course but these are the most obvious at a glance.