Who won the Oscar for Best Actor for 'Milk'?

For which film did Philip Seymour Hoffman win the Oscar for Best Actor? Who won the Oscar for Best Actor for 'The Last King of Scotland'? For which film did Forest Whitaker win the Oscar for Best Actor? Who won the Oscar for Best Actor for 'There Will Be Blood'? Who won the Oscar for Best Actor for 'Crazy Heart'? For which film did Jeff Bridges win the Oscar for Best Actor? Who won the Oscar for Best Actor for 'The King's Speech'? For which film did Colin Firth win the Oscar for Best Actor?