yeh ham. I posted before damax about the double charge which was easier for ppl who were trying to learn the spinshot, and the single charge spinshot. check "sonic techniques" thread.
For air down-b is the simplest to time. for ground i used to have some difficulty timing the sideb method twinkle posted. U can release the analog stick while holding b and the release b and tap straight up and u will get it off. Yes the timing is crucial but once u get it it becomes natural almost over practice. down-b in air; u just down b hold, b for a sec, then release and quickly press up on analog. 5/5 times i can do the downb flawlessly, 4/5 the sideb on ground.
man i wish i had a digi cam or tv tuner to record.