The California Digital Library has a web page [Inside CDL] linking to its working documents. This provides an interesting insight into the shared collection development and technical issues facing a large group of research libraries working to build future infrastructure. Check out its project page for example:

In partnership with the University of California libraries and others, the California Digital Library develops new ways to build, share, and preserve digital information through a variety of projects and programs. [Inside CDL: Projects, Programs & Services]

or its Digital Library Building Blocks page:

The California Digital Library provides software, best practices, and other tools to facilitate digital library operations. [Inside CDL: Digital Library Building Blocks]