Implementing a pattern library in the real world: a Yahoo! case study

Matt Leacock, Erin Malone and Chanel Wheeler have presented an interesting paper on the use of pattern libraries at Yahoo!. To quote:

A case study of the definition, design, and roll-out of an interaction design pattern library at Yahoo! Inc. The process for defining the requirements, design of the application, process for defining the lifecycle of a pattern, as well as the organizational challenges involved are all discussed. (Via Column Two)