Legal experts had earlier predicted Zimmerman would likely be granted bail. Key factors include his ties to the local community and that he doesn’t appear to be a flight risk since he turned himself in voluntarily after he was charged last week. He also has never been convicted of a serious crime, which would indicate he doesn’t pose a threat to society.
“Although it’s not routine for people charged with murder to get bond, they do get bond, and I think there is an excellent argument to be made in his specific case for him to be released on bond,” said defense attorney Randy McClean, who practices in Seminole County, about 15 miles northeast of Orlando.
http://www.nola.com/crime/index.ssf/2012/04/judge_grants_george_zimmerman.html
But this case is not about convicting Zimmerman, or 'justice' for Treyvon this case is about appeasement of the usual race mongers and revenge for Treyvon's death.
The low bail seems an indication of fairness on the part of the judge.