I've heard so far, I would make the guess that Martin was the attacker and that things happened exactly or closely to what Zimmerman described. People suggest that Zimmerman instigated by following him or looking at him, but this can not possibly dismiss that fact that Martin attacked and at that point you have the right to defend yourself. The trial is a sham and is just being done to keep the area from rioting, it should never have gone this far.
"Endless money forms the sinews of war." - Cicero, www.freedomshift.blogspot.com