One of the key criteria that you should have when joining an agency is looking around at your potential colleagues and working out whether you can learn from them and grow as a communications | marketing professional.
At Ruder Finn, I work with a number of people across our offices who are pretty smart across a number of different issues from transmedia campaigns to global health campaigns. Some of this knowledge is captures in an annual publication called Move. You can find an online archive of previous issues here.
I have the latest copy in a large coffee table print format and have a number of copies that I can give away, if you would like a copy drop me a line with your full contact details.