I don't watch lots of anime but I did like the fight scenes in Black Rock Shooter.
I misread the question the first time. Let me try this again: Favorite anime fight scene is Spike fighting his way through the church in Episode 5 of Cowboy Bebop.
Dead leaves- Only an hour and it's funny as sh*t.<br />
Fantastic planet- Only an hour and trippy as sh*t.
youtube " never show off during a fight"
Every single fighting scene from Mardock Scramble.