Number Stations

On the most recent episode of TWiT one of the guys mentioned something called "number stations." Intrigued, I hit up Wikipedia to find out what they're all about. This is some really fascinating stuff.
Number stations are mysterious shortwave radio stations that transmit sequences of numbers and little else. Most people believe they are coded messages to spies from intelligence agencies all around the world. They were first heard some 30 years ago and continue to this day. In fact, (and this is why they were mentioned on TWiT), they are now being transmitted via voip.
My first thought upon hearing this is how awesome it would be to sample a number station in a song, but apparently I'm way too late. A number of artists have already used them and Wilco even named their "Yankee Hotel Foxtrot" after a message heard on one of the stations.
In 1997 a four disc compilation of number station recordings called The Conet Project was released by Irdial Discs. The label has made the entire collection available for free download. The recordings are a bit creepy, especially this one which features a little girl reading the numbers.
This is but one more reason why shortwave radio enthusiasts have a reputation for being the coolest kids on the block.

Update: What an amazing coincidence. I just saw this posted to del.icio.us popular.