All the tributes there are very moving, and if you go through the blog archive there are more.
I thought this analysis of "The Patriot" was very poignant:
"Everything is in place for Gibson to die and for Ledger to avenge him, because the whole point of these archetypal tales is to transmit ancestral truths to young people: your father is going to die, so before he dies learn every trick he has up his sleeve, and then raise good children, love your wife and kill the villain. But, because Gibson was a star of greater magnitude than his Australian compatriot, and because Gibson was directing the film, it was the young Ledger, not the middle-aged Gibson, who died. There was something shockingly wrong about this, something that violated the basic laws of drama. Ledger wasn't supposed to die before Gibson died, not in a motion picture, not in real life. It's not fair. It's not right. It's a terrible way to end what was otherwise a very uplifting story."