AKQA proves that big firms can do great work. They have won every award that isn’t nailed down, have offices in 5 cities around the world and clients like Nike, Mini, Microsoft, and VISA. They are the kind of firm that if they were hiring a creative director in the U.S. I would send them enough resumes to wallpaper their office.
Also check out their book “AKQA Ideas: Vol 1” which has 21 recently launched projects presented as a case study. I personally own this book and it’s only available through the UK version of Amazon.com for about $50 with delivery and usually takes about 4-8 weeks for delivery.