My Flickr patterns collection:
Search results (primarily e-commerce)
Search results for multiple content libraries (such as product catalog and recipes).
Other pattern collections:
Peter Morville – Search patterns
Impressively documented collection of search-related patterns, such as best bets, faceted navigation, auto-suggest, etc.
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.
Factory Joe’s Flickr pattern library
soxiam’s ui/ux Flickr pattern library
Oh, and Yahoo’s Design Pattern Library probably fits here too.
Caitlin Gannon 
