Pattern Library
My Flickr patterns collection (hasn’t been updated in a while):
Search results (primarily e-commerce)
Search results for multiple content libraries (such as product catalog and recipes).
Mobile:
Social:
Designing Social Interfaces
The Designing Social Interfaces patterns wiki is a companion site to the book that Christian Crumlish and Erin Malone are currently writing for O’Reilly Media.
Other pattern collections:
Peter Morville – Search patterns
Impressively documented collection of search-related patterns, such as best bets, faceted navigation, auto-suggest, etc.