On the media centre theme:
I've installed Ushare on my Linkstation NAS, so it can now work as a media server for the Xbox 360. I tried this a while back, but it didn't work - I've now figured you need to make sure Ushare is running with the "-x" option for Xbox compatibility. And I think you can only have one directory shared.
So now I can dump Xvid videos on the NAS and watch them through the Xbox which is connected to a projector in the living room. Its also good for slideshows of photos.
Though its not so good for MP3s, as Ushare doesn't support ID3 tags etc. So the Xbox doesn't sort the MP3s by artist / album, its just a long list of tracks, which is annoying if its over 4000 tracks.
I think I might try FUPPES instead, which apparently does support metadata and has other Xbox specific enhancements.