Can I stream music from my laptop to my iPod Touch over wifi? Rather than running a long cable from my Laptop to my stereo, I've been thinking for a while about getting one of those wireless devices that lets you transmit audio from your PC to a receiver plugged into the stereo.

Then I realised I already have hardware that can potentially do this - I have an iPod Touch, and a Wi-Fi network in the house.

So, is there some iPod Touch App that will let the iPod act as a Wi-Fi music receiver? And presumably, a corresponding piece of broadcast software for my (Windows Vista) Laptop?

edit: Bonus points for a solution that lets me stream all audio from the laptop, rather than just streaming music tracks.
You can use the Windows version of Airfoil to send any audio to an Airport Express connected to a stereo.  The page above claims it can do the same via an iPod Touch as well.  And you can try it for free.