Searching for the yorker

In cricket, the fast bowler's greatest weapon is the yorker, a delivery aimed at high speed at the batsman's feet.  A fabulous example of it can be seen here, with Pakistan's Waqar Younis knocking Brian Lara (West Indies) off his feet, and his leg stump out of the ground.  In this year's World Cup, meanwhile, Lasith Malinga of Sri Lanka gave a masterclass in yorker bowling against Kenya.

But why is a yorker called a yorker?  Does it have anything to do with York, whose residents are sometimes called Yorkers, or is that just coincidence?  After a bit of etymological research I can exclusively reveal that, erm, I don't know, but that there's definitely an interesting story to tell:

Searching for the yorker | ESPN Cricinfo