Sorry for babbling on about about my love for this game and my awkward voice.
Here are some of the controls for tricks, grabs and rotations:
L1 - Shifty
L1 + L2 - Shuffle
Down + L2 - Method
Down + R1 - Lien Air
Up + R1 - Mute Grab
Down + R2 - Stalefish
Up + R2 - Indy Grab
Down, Down then R2 - Tail Grab
Up, Up then R1 - Nose Grab
Up + L2 + R2 - Indy Nosebone
Up + R1 + L2 - Stiffie
Down + R1 + L2 - Melancholy
Down + R1 + L1 - Tweak
Rotational Tricks
Flip - Up or Down + X after launching
Backside or frontside spin - Left or Right + X after launching
Misty and Variations - any two direction on D-pad and X after launching