He was the main reason I absolutely loved Bram Stoker's Dracula. /forums/images/graemlins/grin.gif
If this rumour is true, I am one happy camper. /forums/images/graemlins/cool.gif I must admit I didn't think of him for the role of Sirius, but he'd be great in it. He's been excellent in everything I've seen him in.
Looks like Warner Bros. has officially announced both now - Gary Oldman will indeed take on the role of Sirius Black and Michael Gambon will become Dumbledore in The Prisoner of Azkaban. There's an article on it here.