A great (investigative) article from Kunal Dutta from Media Week last week [1] (02 September 2009, 1:20pm) that looks at the ‘idiosyncratic business models’ of the UK Poster Specialists.
Some bitter folks in our (digital out of home sector) industry would actually call it a cartel [2]) but that may be going just a bit too far.
Anyway, well worth a read.