PHP Marketing War Chest
Marco aims to publish a number of case studies on the adoption of PHP in small, medium, and large businesses (or enterprise, if you will) with the intention of creating a kind of marketing "war chest". The idea is to form a kind of business PHP hub that will help other businesses to make a more informed decision when it comes to adopting PHP.
Marco is looking for people to write case studies in marketing-speak to use there; for more information, read Marco's blog entry.