My Home server is based on Win 2000 Server OS (runs as a DNS, WebServer, Mail server etc) It also used to be be the media server to my Pinnacle Showcase unit. Just got the XBOX360 yesterday and was loooking to see what options I had with Win2K server and streaming .. Stumbled across
http://www.tversity.com/Works fine as a picture, music server to the Xbox

install was a dream .. simple
Have not tried Movies yet, however thats what it was first created for so should be OK ..
Also offers web media options ie can stream pics, music from the web..
Hope it helps some others who may not be able to run the MS offerings