Shhhh, don't tell, but he was referring to Adobe and Apple as separate tray icons.

That's not the devision of Admin/user intended. A user has the full rights to modify files, run scripts, send email and everything, but he can only do so in his own domain. The only thing the user can't do is modify stuff that's owned by other users, or modify the system itself. What this means is that by default: Nothing you do as a user can hurt the computer that much. Sure, you can get a virus if you try, but that virus will only be able to affect your own files, the computer itself will remain running. and other users won't be affected. This system does work for home systems with only one user. YOu can simply use the computer without fear of breaking anything, and when you want to modify the system (change system files), you just need to put in a password. Sadly, Windows will never function like this. As said before, backwards compatibility is too big a price to offer, and too many software depends on being able to play with the system in any way it pleases.

Amarok doesn't have problems with huge playlists. It's the choice of database at first startup. The default option (SQLite) is rather slow on large databases. This shouldn't be a problem because you can select other database types such as MySQL that are much faster.