Okay I guess I should start off!
Combatants: Sasuke vs. Orochimaru
Location: Forest of Death
Time: Second phase of the Chuunin Exam
Description: It starts with Sasuke being completely overwhelmed by Orochimarus power and not fighting back, until Naruto saves him by stopping the gigantic snake summon (hey, Naruto did something cool!), then Naruto is knocked out and Sasuke goes all out on Oro, using his sharingan to do some sweet high speed moves while Oro stretches like a snake and goes crazy, Sasuke does a nice finishing move where he grabs Oro by the waist and does a 100ft dive slamming him headfirst into a tree, but it was a clone, and Oro is about to pwn Sasuke but he attached explosive balls to Oro and when they blow Sasuke uses the distraction to throw Shuriken with strings attached and tie Oro to a tree, and uses his Dragon fire blast finishing move (prolly got the name wrong) pretty much destroying the GIANT tree Oro is tied to. Oro's fake "face" starts to melt off but he is completely unharmed, calmly walks forward snapping the wires, and then dissapears melding into the tree.
Comments: This fight scene had great animation and moves in it, and it was nice seeing Sasuke going all out like that in a fight he pretty much couldn't win.
P.S. This isn't the only fight scene I love, I'll be posting more when I have time to describe them and stuff, and feel free to post yours!