Copyright On Architecture (among Other Things) - Website
Just ran across this website this morning, and with all the questions I see on Discussisons regarding copyright, I thought others might find it useful:
http://wiki.gettyimages.com/category/architecture
Oh yes, the disclaimer - I am not a lawyer, never have been, likely never will be, cannot expound further upon the subject and am not responsible for use of this message or any other :)
** Mary Lee Dereske
ps - the Getty site covers all sorts of things beyond architecture - I didn't realize that you can't even show an Airstream, whether or not the logo is showing, and license the image.