One of the reasons why the blogosphere is such a valuable learning experience is the increasing number of people with real knowledge and experience who have taken to using the medium to express their views.
As a case in point, consider Paul Barrett's Reflections on events in Iran. Paul has researched this post and gives his main source. His comments are tempered by his experience as a senior Australian public servant. I learned more from this single post than from all the reporting I had seen during the crisis.
Mind you, I could be a bit biased. Paul is a New Englander like me! We do get around.