for 360, get off your board, walk a step forward, hit Y, then before he gets back on his board, hit LT + RT + B (superdude). If you do it right, he'll fly.

There's another way, that's better, but harder.
Press both RT and LT to the point where they are crouched down as far as they can be without touching the board, then do a no-comply. It'll pay off more than the other one, but takes some practice.
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You have to get off board and when getting on it again quickly press L2+R2+Circle.

Another way of doing this is, to hold L2+R2 before you get off your board and then press triangle, then triangle again and qoickly circle when your board is about to touch the ground. Don't forget to hold them until you fly up...

Remember, practice makes perfect...
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