I am Happy as a Clam: Stream to an Apple Airport Express from anything in Windows
This is a purely geeky endorsement, but I have been waiting for something like this for a long time. Finally a great programmer has enabled me to entirely ditch the bloatware that is Apple's iTunes. Now I can stream any audio from my PC to my Airport Express router, which is connected to my stereo. If you have an Airport Express and Windows and don't like using iTunes, give this app a try immediately. This is very helpful if you use a vastly superior playback program like Winamp.