I've not commented on the Zimmerman trial because I don't feel qualified to do so. I didn't watch the trial or research any of the evidence. So when people ask me about my thoughts on George Zimmerman and Trayvon Martin I prefer to refer them to better men.
Massad Ayoob is an expert in the field of self defense and the criminal proceedings thereafter. He spoke with Zimmerman's attorneys and followed the trial. His legal knowledge and understanding combined with his closeness to the case give him far more authority to discuss the case than many of the people who have been giving opinions.
Read his series on the Zimmerman trial. I think you will find them well worth your time:
The Zimmerman Verdict, Part 1
Zimmerman Verdict, Part 2: "The Unarmed Teen"
Zimmerman Verdict, Part 3: "Who Started It?"
Zimmerman Verdict: The Stand Your Ground Element
Zimmerman Verdict, Part 5: The Gun Stuff
The Zimmerman Verdict, Part 6: "What if" Versus "What Is"
Zimmerman Verdict, Part 7: Why The Jury Didn't Learn About Trayvon Martin
Zimmerman Verdict, Part 8: The Quantity of Injury Argument
Zimmerman Verdict, Part 9: The Propaganda Factor
Zimmerman Verdict Part 10: The Semantics
Zimmerman Verdict Part 11: Rating the Lawyers (Defense)
Zimmerman Verdict Part 12: Rating the Lawyers (Prosecution)
Zimmerman Verdict Part 13: Angela Corey
The stand your ground one is particularly good.