Send any audio to your stereo system via airport
One of the gadgets I love the most is my Airport Express from Apple.
It gets the most use streaming audio from iTunes onto my stereo system. One major gripe I’ve had with the Airport Express is that I have to use iTunes to send music to it.
Luckilly I stumbled across Airfoil for Mac and Windows, which streams any audio on your computer to the Airport Express.

I’ve got it running with Pandora Radio right now, and it’s working perfectly.
I love technology.
UPDATE
I also must say, they have a genius way to make you purchase the damn software. They get you hooked listening to your favorite music, then overlay white noise on top of the broadcast after a few minutes and prompt you with a dialog to purchase.
Now if I could only build in something like that to Cashboard.
