The small land-locked kingdom of Bhutan has done some great postage stamps!
Burt Todd, an American entrepreneur, developed a series of interesting and innovative stamps for this small country. Some were on silk or steel, some were scented, some were in 3-D, and some were talking! Stamps which were cut discs of grooved rubber actually played the national anthem or the history of the country when turned on a record player.
Check out more on the The Stamp Echo