Or: Why you must work in sRGB
I'm writing this post in hopes of preventing some of the recent 
damage from yet another CreativeLive disaster.  I despair when I think 
of the thousands of workflows that are complicated, and the countless 
images that are ruined, by persistent advice to edit in large colour 
spaces.
It's terribly sad that so many prominent photographers 
sabotage the workflows of emerging photographers by advocating Adobe RGB
 or even ProPhoto RGB as the working space of choice.  I don't think 
this sabotage is deliberate (although it certainly might be in some 
cases).  I think these photographers simply enjoy the false impression 
of "expertise" that such advice gives them.  "Oh, that guy works in 
Adobe RGB - he must be an expert!"  WRONG.