DCG's Guide to European Providers for Web Content and CEM
I've been a big fan of Digital Clarity Group ever since they formed. There are some amazing people working for DCG and the work they put out is quite frankly spectacular. Last year they put out their 2013 North America Guide to Service Providers for Web Content and Customer Experience Management and I was blown away. Many of the answers to the questions I'm often asked about various agencies and integrators are in this guide.