Registration for Interstices 2012 “Immaterial Materialities – Materiality and Interactivity in Art and Architecture” is now open.
These are freely available datasets from here and around the world. Some are accessible via API's, which are an automated way to mine data into software like Google Refine.
Finding Building Plans - using books
Here is a large set of images from the new James B. Hunt Jr Library at North Carolina State University (NCSU).
I was fortunate enough to attend the second Designing Libraries Conference that was held this year in the Hunt Library. It was massively over-subscribed by librarians from all over North America and various parts of the rest of the world, such is its reputation already.