A point to consider:
The 360 has two media playback applications and they work differently:
DiVX playback support is via the Dashboard Media Player *not* the Media Center Extender client.
Which means you can stream it via UPnP/AV (Windows Media Player/Zune/Connect360, whatever) or play it via DVD-ROM, or USB-mass storage Drives, but *not* using the Media Center Client.
Shouldn't be much of an issue since a Media Center PC can also stream via UPnP/AV, but it does mean you have to set up *both* connections.
Carry on with the celebrations, guys...
