Flickr In The Real World - Instant Fave! They print up little cards that look like the "favorite" icon in flickr, and take photos of things they like with them.
I had to join, of course. Now to get me some of those little cards.
In the meantime, here's one of my favorites from the FITRW pool, Wall-e's Instant Fave! by http://www.flickr.com/photos/meddygarnet/.