The PS3 version of Live 08 has motion sensing freethrows. Simply hold one of the following buttons: R1, R2, L1, L2, and pull the controller towards your chest until the ball is at the players head, and then pull the controller down.
I know my explanation sucks, so use the freethrow help by pressing triangle first, then press X to read the motion freethrow help. Press X to close the help.
Obviously this is only for the PS3.