If you have been waiting for MediaBox Media Center on the N900, then I have good news for you.
MediaBox version 2010.01.03 is now going to extras-testing for some QA. In the meantime for you to watch, I have recorded some videos with the N900's awesome TV-out feature.
Browsing UPnP shares with MediaBox is as easy as browsing the filesystem. In this video MediaBox is used for watching a movie over WiFi on the N900.
A new feature of MediaBox is the shelf. It's the starting folder where you can always return with the press of a button. You can put shortcuts to almost anything on the shelf for quick access (songs, albums, artists, videos, photos, folders, internet radio stations, playlists, you name it).
MediaBox has a finger-friendly way of reordering playlists. Simply drag the items with your finger.
Oh yes, this video shows MediaBox in portrait mode.
The upcoming MediaBox for Diablo for N8x0 will be quite similar to this version.