Word of Mouth Marketing Association -- WOMMA - Word of Mouth Case Studies
WOMMA's Case Study Library is a "how-to" resource intended to help you gain a better understanding of the different types of word of mouth marketing that exist, as well as how to put them to work for you.

Implementing a Pattern Library in the Real World: A Yahoo! Case Study - Boxes and Arrows: The design behind the design
Wherever possible, we attempted to build “hooks” into Yahoo!’s existing design process. For example, we knew that new interaction design solutions are often identified during design reviews, so the step of “identify pattern” was added to our...