In OS X Lion there was the preference (via a Terminal command) to enable iTunes track notifications that were displayed as a popup in the dock.
So far it seems as though Mountain Lion does not allow this, I was wondering if anyone knew whether the command had changed or if this is just not possible in OS X 10.8.
The Terminal command I had been using in Lion was:
defaults write com.apple.dock itunes-notifications -bool TRUE; killall Dock