Numismatic News is a great publication regarding insightful discussion based around this hobby and industry. I've had a few discussions with their team regarding trends, history, and the constant evolution of coins and collectors. Linked below are two publications of their newsletter from last year, in reference of those topics, which I'd like to share.

http://www.numismaticnews.net/article/this-weeks-letters-120313
(Third letter from the top titled "Viewpoint")

http://www.numismaticnews.net/article/silver-round-bears-barber-design
(Write-up regarding one of William Barber's pattern designs)

Between Numismatic News, The Numismatist, and Coin World, one can always find something new to learn in this field!