urns out there an iTunes Dock setting for the Mac, hidden deep inside the new Lion OS. Once activated, the Dock will produce a pop-up notification of which iTunes track is currently playing. Although you can program Growl, a useful little utility, to show similar notifications, you may prefer having the native one found in Lion.
The feature is only available to those running the latest OS X Lion 10.7 and above. It just need to be activated. After following a few simple steps, a window will appear above the iTunes icon on your Dock each time a new track starts, displaying the artist and song title. The notification window will automatically remove itself after a few seconds.





Activation :

Step 1: Quit iTunes.

Step 2: Open Terminal (Found in Macintosh HD > Applications > Utilities).

Step 3: Copy and paste the following command:

defaults write com.apple.dock itunes-notifications -bool TRUE;killall Dock

Step 4 (Optional): You can customize it even further by adding the iTunes icon inside the popup along with the song info. Just add the following command:

Quote :

defaults write com.apple.dock notification-always-show-image -bool TRUE;killall Dock

Step 5: Open iTunes and give it a try!


If you want to disable it in future follow,

Deactivation :

Step 1: Quit iTunes.

Step 2: Open Terminal.

Step 3: Copy and paste the following two lines:

Quote :

defaults delete com.apple.dock itunes-notifications

defaults delete com.apple.dock notification-always-show-image;killall Dock

Keir Thomas discovered this handy little feature and shared it on Mac OS X Hints. He mentions that when he found the tweak, it came bundled with options allowing you to change the size (height and width) of the notification window. Apple could have been working on a new notification system to use with OS X applications but may not have been ready to make it official.
Stay tuned for more tips & tricks for OS X...