Jesse James Garrett conducts a nice, wide ranging interview about Flickr with Eric Costello, lead client UI developer for the photo sharing site. Just lots of good background material on where Flickr came from and how it operates. For example, some of Flickr's inspiration came from Neopets. I wrote about Neopets before Flickr even existed but didn't take the media objects as community focus angle.
Thumbs up to Garrett for usefully condensing what I'm sure was quite a bit of material.