Huffington Post says:

Circuit Judge Kenneth Lester set Zimmerman's bond at $150,000, but said he would not be released today, pending deliberations about the terms of the release.

The bail hearing featured dramatic testimony from Zimmerman, who took the stand and offered an apology to Martin's parents.

"I wanted to say that I am sorry for the loss of your son," Zimmerman said..."I thought he was a little bit younger than I am," he said. "I did not know whether he was armed or not."

As to the "little bit younger" part of his testimony, it seems to conflict with some of the evidence we've already seen: In the transcript of the 911 call, Zimmerman tells the operator (correctly) that Martin appears to be "in his late teens." Zimmerman is 28.