Mac/Windows/Linux: dupeGuru is a free, open source and cross-platform utility that will scan and help you remove duplicate audio files from your music library. The app uses filename, creation date, tag information and metadata, and even the audio fingerprint of the file to determine which songs are duplicates, even if they're named differently.
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Mac: Song Announcer is a utility that works with iTunes to announce the artist and name of the song that's about to play, lets you control playlists and playback from the menu bar or even your web browser. The app uses text-to-speech to speak the song info to you so you never have to switch to iTunes to see what's playing.
Windows: There's no shortage of applications that add virtual desktops to Windows, but nSpaces is one of the easiest to use and easiest to set up, complete with hotkeys for desktop switching, program memory so apps always open on the right desktop, and even the ability to password protect virtual desktops for security.