That wasn't a drop. I doubt many keepers in the world would have stopped that. It deviated so much and dipped as well, doesn't count as a drop.
Hussey is looking top class. People were claiming that his form was temporary and that he wouldn't be averaging close to 70 after 2 years of Test Cricket, but look at him go now, his average is actually still on the up. To average over 70 in modern Test Cricket is unbelievable. If he bats for another 5 years at this level he'll go on to be one of the greats of the game I reckon.