The Incredible Mobot
Ralph Thomas has a year-long project going in which he designs a new postcard each month, a la those ads that used to appear in comic books when we old guys were kids, then silkscreens them onto cereal-box cardboard. He sends out six per week, and I was lucky enough to get one yesterday! Visit his website to find out how to get one of your own.
Update: check out more Ralph Thomas postcards on these other postcard blogs: