A quick and dirty explanation is that the h-back is a hybrid postion that combines the blocking duties of the FB with the receiving duties of the TE.
Here's a good explanation:
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Buchsbaum: A tight end generally lines up next to the tackle, close to the line of scrimmage on the strong side. He is generally in a down position with one hand down on the ground. An H-back often goes in motion and is used as a blocker in a momentum situation, where he’s in motion and turning upfield at the time the block needs to be thrown. Or, the H-back can be used more like a flanker. By putting the H-back in motion, the offense creates confusion for the defense: who’s going to guard him; when he blocks, whom is he going to go after; etc. The H-back is generally more of an athletic player than the tight end.
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source:
http://archive.profootballweekly.com...101_052300.asp