WookieD
Didier Zokora
Nicholson in One Flew Over Cuckoo's Nest and The Shining
Add China Town to the list of Nicholson greats... and I have to say it, his portrayal of the Joker was absolutely superb, certainly fitted Tim Burton's vision of the Joker anyway. Some excellent one liners in that movie.
Loads of other good actors in this list so far but I personally would have to put Alan Rickman in there for his dry humour and Heath Ledger has to get a nod as well as, having seen him as the Joker countless times, I still cannot see Ledger underneath the make up, it's an incredible acting role.
I also think that Chloe Moretz is a brilliant actress. Seen her in Kickass, Hugo and then me and the missus watched Let Me In the other day (new Hammer Horror film) and she's just cracking. Hope she manages to bridge from child actress to the real thing.