One of the best sources, if not the best, is RubinReports by Professor Barry Rubin.
He has the additional merit of not being related to me.
His writing and analysis of complex issues make reading him a delight, and I highly recommend that you click on a link above and subscribe to his blog if you want/need to make sense of what is happening in the Middle East.
Oh, and he just published anew book about Lebanon.
Barry, Five Stars plus Two Thumbs Up for common sense and good writing brought to a complex and difficult situation.