What is it? Simply an acronym for “discovery to delivery,” the process that a person goes through to get anything from a peer-reviewed research article to a new pair of Manolo Blahniks. Four steps are often outlined: discovery, location, request, delivery.
Unfortunately, and for many reasons, much of the free web does a better job at providing a seamless D2D experience than libraries. What with our catalogs, database lists, metasearching, ILL systems, next gen catalog overlays, and tools and technologies yet to be developed (not to mention links into library resources from sites like Google and Windows Live Academic), you can expect the D2D puzzle to occupy the profession and show up on blogs, programs, and journal pages for the foreseeable future.