This will show you how to get a cool itunes ‘now playing’ notification in your dock
open terminal.app
type:
defaults write com.apple.dock itunes-notifications -bool TRUE
killall -9 Dock
this will enable the setting and the next time you play something in itunes it will show you with a neat popup above your itunes icon!
to disable it
defaults write com.apple.dock itunes-notifications -bool FALSE
killall -9 Dock