He was good in: 10 things I hate about you, The Patriot, A knight's tale, - Some of you might have been too young back then. Those first 2 were his major breaks, and the 3rd was his first leading role!
Then he was even better in: Monster's Ball, Ned Kelly, and Lord of Dogtown (u guys should check this last one out).
Then there's also: Candy (good acting by both him and Abbie Cornish) and he was funny in "Casanova" (Also starring Jeremy Irons).
As for how he died, since there's always an idiot talking sh*t, he died of a sleeping pill overdose. he popped the pill went to sleep and never woke up. exhaustion leads to insomnia, insomnia leads to a sh*tty time....he tried to fix it, and it ended up badly. :(