There are a lot of images on Flickr that I'd love to be able to have a mailable postcard of, printed in small quantities so that I can send a postcard to someone's fridge or to reach people who are not online.
What's the best way to print a postcard from Flickr?
Steve Cisler once sent me a postcard that was just a regular drugstore print with a message and a stamp written on the back. I'm pretty sure it was legally mailable, though it got a little bit crumpled along the way.
Kodak made real-photo postcards between 1902 and 1910, which is roughly the technology I'm after.
UPDATE 11/15/2005: Flickr support says that none of their partners print postcards.