The first few posts were found on Flickr browsing for Creative Commons licensed imagery, but after getting onto the first few sites like digg submissions started rolling in.

I think a year after I started the site was when my first major office design of Google's office in Stockholm was sent in by the architect. Before then the site was mostly candid tours from random people and random companies.

Edit: I think I have ~60 projects on the calendar to be published right now.