iClip Lyrics is an easy to use iTunes Tool that searches for the lyrics of playing track and adds it in the TagID3.
If the lyrics has not been found you can start a Google Search, select the lyrics and paste it in the current song with a click! iClip Lyrics allows you easly edit the lyrics and save changes with a few click. You can also keep iClip Lyrics forward other application to display the lyrics always on top.
Mac OS X 10.5 or higher. iTunes 7.4 or higher.