Synergy is a tiny Cocoa application for Mac OS X 10.2 (and later) that puts three buttons to control iTunes in your menubar: previous track, next track, and play/pause. It also provides you with visual feedback about the currently playing tune and allows you to control iTunes via system-wide hot key combinations. These features provide a very fast way of skipping between songs when using the keyboard or the mouse, without having to switch to iTunes or access its Dock menu.
DesktopLyrics is an application that displays the lyrics of the song currently playing in "iTunes" right on your desktop. The lyrics for the song have to be set in iTunes; DesktopLyrics does nothing to fetch them if they aren't available in iTunes. If you don't want to set all your lyrics manually, you can use an application like "Harmonic".
With one click, FileMyFiles will organize all of the files on your desktop. There are powerful options to change file and folder names. It will uninstall applications and all of their related files and folders. It can selectively delete just some of the files and folders from the trash. It can also be scheduled to keep all of your important folders organized. Files are sorted and put into folders according to eight categories of file types: Words, Images, Audio, Compressed, Data, Layout, Video, and Web. FileMyFiles will keep all of your files organized, leaving your desktop and other important folders uncluttered and your files easy to find.