New library for PWM playback from SD cards: SimpleSDAudio

I'm loving this, already using it in a solar-powered project.

Now, maybe I'm daydreaming, but I would love to be able to output AM Radio Modulation instead of audio. ]

http://dangerousprototypes.com/2011/10/05/am-sofware-radio-using-arduino/

Code:
http://dangerousprototypes.com/forum/download/file.php?id=5107&sid=9ed56f436c83604b287f75ec73f11146