Is there a way (using .net) to connect an application i write to the 360? What I want to do is write a custom media sharing application, and have the contents stream to an xbox.
I see that there is an application for the mac called Connect360 that does this, so there must be a way, right?
I think in XNA there is a object that can be used for sockets. You'll probably need to utilize the socket object to connect back to your PC.
Assuming you want to use the media player built into the Xbox 360, i think you will need to look into media streaming standards and what one's the 360 recognizes (i'm not sure myself).
You may also be interested in TVersity which handles a wide range of streaming capabilities.
Write a DLNA server. There's a media sharing server for linux that you can look into for an idea on how the protocols work, but I don't remember what it's called.
Connect360 emulates Windows Media Server. All the 360 is doing is connecting to a Windows Media Server like it would normally (or so it thinks).
XBMC which uses the Platinum UPnP library, had Xbox 360 support at one point. Not sure if it still does. However, both are open source and under revision control, so the source code should give you a good idea of how to implement UPnP support in your application.
Yes XBMC uses Platinum SDK and is still working with the 360. The Platinum UPnP SDK is a cross-platform Open source SDK and you can literally enable 360 support to your app within minutes.