You don’t take a Penalty for making melee attacks while Prone.
While you are Prone you are not Flat-Footed against the attacks of other Prone creatures.
When you use the Fall Prone action, you can use it as a Free Action without gaining any levels of the Stunned condition.
When you use the Stand action you do not trigger Reactions.
You can Crawl up to half your Speed, rounded down to the nearest multiple of 5 feet, rather than just 5 feet.