Windows: good, simple music streaming?

Solution 1:

Have a look at the newly-released from beta Audiogalaxy...featured by Lifehacker.com, it has clients for Mac OSX and Windows...iPod/iPhone, and Android apps also exist.

Highly recommend, works well, and fast!

Solution 2:

You may want to give VLC a try. I've only ever used it as a player (which it's great at), but it was initially designed to be a media streaming server. It sounds like it should fit your needs pretty well. Plus, it's cross-platform! VLC can stream from a video file on the hard disk, a DVD or CD, a digital TV card, or other video input devices.

Solution 3:

Linux + MPD

Can't really beat that combination IMHO.