Bhutan -- Land of the Thunder Dragon -- is on the cutting edge when it comes to postage stamps. It has a stamp on a CD-ROM, roughly 4 inches in diameter, seen in this image. The CD plays a video on the history of the country's kings. Other philatelic highlights from Bhutan include 3-D stamps and scented stamps, as well as stamps printed on steel, silk, and extruded plastic.
Want to buy the stamp? Check out the "Marketplace" tent at the 42nd annual Smithsonian Folklife Festival in Washington, held through June 29 and again from July 2 to 6. In addition to its exhibition on Bhutan, the event has programs on NASA ("Fifty Years and Beyond") and Texas ("A Celebration of Music, Food, and Wine").