The law permits the batsman to handle the ball with his hand (the non bat holding hand). But thats to avoid injury. But here, the intention of the batsman was in doubt. He stretched his hand way too far in front of him to create the doubt that he was trying to deflect the ball away from reaching the keeper. As Dhoni says, we need clearer rules. With so much of protective gear being used these days, batsmen should wear enough protective equipment to easily take body blows, and so they should not be allowed to use their hands to keep the ball away. If you use your hands, it should be OUT!! Then the question of whether the batsman was intending to avoid injury or trying to deflect the ball doesnt come into picture.
This is the important part, and it's why it's really a 50/50 call - almost an impossible call to make. How can you guess what Hussey was intending for sure? To me he had his hand up to defend his body from the ball - but to others he had his hand up to interfere when he didn't need to. However Hussey made it look bad by putting his hand up way too early and it ended up further from his body than it needed to be. But I do agree with you about what the law should be, I think the only time the batsman should be able to handle the ball is to a) give the ball back to fielders when its stuck in his pad or lying at his feet, or b) as a reflexive defensive action eg. a wild return to the keeper that comes near the head when the batsman isn't ready. Hussey's seemed to be to defend himself, but it wasn't reflexive to me and while I can see why he was given not out under the current laws, I don't think we should be promoting that behaviour.
Interesting that some of the Indian commentators reckoned Hussey wasn't out, but many of the Aussie ones wanted it given out. Who said there was bias?
Regarding the Tendulkar incident, Lee was clearly obstructing the batsman. He knew the law (that he was perfectly OK doing it) and that he knew Sachin was headed in that direction and so he perfectly positioned himself to slow down Tendulkar. All clarity in the law here is required. If the bowler stands in the way of the batsman's direction and the fielding team runs him out, the decision should go in the batsman's favor. Today the laws of the game were scrutinised pretty hard, and they failed the test.
I think you're wrong, Lee started out going for the ball and then once it went squarer found himself in the middle not knowing where to go - if at that stage he'd kept veering wider, THEN I might have smelled a rat. But he just stopped and if anything, moved closer to the pitch. At no stage does he look to see where Tendulkar is. Is Lee some kind of Jedi who senses that he's disrupting Sachin? No. When you see the reverse angle, it's pretty clear that Lee doesn't really go far off the pitch anyway. Sachin just didn't anticipate Lee's path very well. AND...the laws say it's up to the batsman to find his way to the other end ie. the bowler is quite entitled to run where he likes, he just can't deliberately block the batsman. And while like the Hussey intent, we can't be absolutely certain that Lee didn't block Tendulkar, I think the evidence suggests that he didn't - otherwise he could have done a better job of it.