Just took in the opening keynote at code4lib '08, Portland.
The Internet Archive/OpenLibrary project takes the most open approach to digital collections and digitization projects. Also the most centralized.
They've got big aspirations: archive of all web pages, a catalog with every book, a major digitization initiative.
The overlapping goals of their project with Google Books, WorldCat, and other more localized digitization projects makes you wonder about which projects will last. Or can they all coexist?