In reply to Denni:
I don't rate Kill Bill for fight scenes. I can just tell the whole time that Uma Thurman isn't a good martial artist (i.e. she holds a katana with the wrong grip) and it ruins it for me.
I love the fight scenes in old skool Jackie Chan movies. Most of the fight scenes and choreography in Drunken Master and Snake in the Eagle's Shadow are amazing for their athleticism, coordination and humour.
There's an incredible fight scene in The Legend of Fong Sai Yuk with Jet Li where he fights while running on people's heads.
Warrior contained some very realistic MMA-style fight scenes - particularly the final fight was good.
I also thought recently that the fight scene in Inception with the room rolling round and round was fantastic.