Over at The Social Customer Manifesto, they have a cute hack. Basically, he buys a simple $25 mp3 player that also looks like a thumb drive. He copies Doppler to it, and sets it to autorun so that when he plugs the MP3 player into his laptop, it automatically runs Doppler and copies new files to player. Neat! Check it out.

Addendum: does anyone know why Doppler insists on doing so many HEAD requests?