The XBoX 360 will only see other Pc's (the pc's must also be running a version of "windows media connect") I have tried hooking up them both through my network and also with a direct usb connection.
The 360 will only stream music and pictures (not video) from a Pc, It must be a "MCE" to stream video.
AT&T TCD130040 40 hour
Tivo TCD540040 40 hour
TTG slow but awesome
Tivo User Since January 12, 2002