Valor Form - High Jump - Lets you jump higher!
Wisdom Form - Quick Run - Short dash in any direction.
Master Form - Aerial Dodge - Basically a second jump. Deflects some projectiles.
Final Form - Glide - Break the laws of physics and fly around. Different from the KH1 version, you can glide without moving, and glide just above the ground for eternity if the ground is flat and you never let go of the Square button.

Might as well add this...

LIMIT FORM - KH2FM+ ONLY! - Dodge Roll - Classic KH Dodge Roll to move quickly in any direction. Completely nullfies all damage during the Dodge Roll.

FQ.