Khan's "chin" is almost a non-factor for me now. I'm confident in his ability to take a good shot. No doubt he'll probably get stopped again, but it won't be anytime soon I don't think, and it'll only happen when he gets lazy, overconfident and careless (ala Lennox Lewis).
I'm on this... I think he was young, cutting too much weight and maybe even a step too far too soon when he got sparked. I used to not be a fan of his but each time I see him in the ring he wins me over! Lynchburg