The title of your thread seems pretty insensitive if you don't mind me saying. But yes this is really sad. I really liked him as an actor. He was great in Brokeback Mountain and I heard such great things about him as the Joker. And shame on you ppl who automatically assumed it was suicide. Maybe you should read a lil more and would have saw that it was most likely an accident.
To honor him I think I will watch all his movies in the week leading up to Dark Knight.