British Psychological Society Publishes Guidelines on Hoarding
In the most recent DSM, hoarding was given its own diagnosis. Prior to that, it was hitched to OCD as subtype. I was glad when the DSM-5 gave hoarding a separate diagnosis, as in my experience, hoarding often presents as different enough from OCD that a separate diagnosis seems warranted. This may also help encourage more research about hoarding disorder, as researchers tend to devote more resources towards problems with an official diagnosis. The International OCD Foundation recently created a linked but separate website for hoarding disorder.
In the June 2015 issues of their journal, the British Psychological Society (BPS) devoted the entire issue to providing up-to-date information about hoarding disorder. It’s a tremendous resource for any professional interested in working with hoarding.