Offtopic, but a bit related:
In my opinion Mediaportal and it's plugins currently relies too much on keyboard and mouse interaction outside the Mediaportal application itself.
For me the production setup is HTPC in my living room with a remote, that's it. I don't want to fiddle stuff with the keyboard and mouse on daily or even weekly basis. Plugins should expose more functionality to the actual GUI itself. I remember an older Moving Pictures version where I had to actually wait a quite long time for the movie to show up in the UI when I had just transferred it to my HTPC since there was no refresh option (and I think there's no such option today but the file watcher has probably been improved since I don't have to wait so long).
Same goes with installing, updating and configuration of plugins, in XBMC it's pure gold.