Dude, i just watched the POA trailer 4 times.....
I am still in squee mode so i will post
my commentary when i am more coherent


EDIT: My fave parts were

The potions class scene

Lily and James dancing

The akward Hermion/Ron
handholding moment

The Knight Bus

What shall now be known as AKA
"The punch heard around the world"

Harry's speech about Sirius

and of course "EXPECTO PATRONUM "!!!!