tuppesoft has released AudioTunnel, which consists of two VST effect plug-ins for Windows that allow streaming audio from one PC to another through Ethernet or WiFi adapters. It does only one thing but it does it as best as possible: network transmission is highly optimized, resulting in a smooth transmission with no stuttering. Audio is not processed in any way: no compression and/or bit reduction; setup is easy and straightforward.
AudioTunnel is available as fully-functional Donationware.