Home Media Devices

Streamium wireless home entertainment – PC link your home entertainment system.
Philips and several other companies have taken the idea of streaming radio tuners one step further and created devices that allow you to view media content from your PC and the internet (photos, music, videos) on your TV.
The interesting thing is that these devices seem to be conforming to a standard called UPNP which I believe has to do with Zeroconf/Rendezvous.
It also looks like TiVo is going in this direction as well with their Home Media Option.

Finally, an Open Source MPEG-4 solution in Java!

MediaFrame (mediaframe.org), open streaming media
From the site:
Open source streaming media in Java
MediaFrame is an Open Source streaming media platform in Java which provides a fast, easy to implement and extremely small applet that enables over 97% (AdShadow 2002-03) of web users to view your audio/video content without having to rely on external player applications or bulky plug-ins. MediaFrame does not require special servers, software or programming knowledge (feature list).