Griffin Technology makes a nifty device called the Griffin Powermate (Available at ThinkGeek). It's essentiall a knob+button you put on your desktop. However, unless you have software that can take advantage of it, it's basically a lighted paperweight. I got fed up not having an easy way to monitor/read this device for use in scripts and so I wrote grifcat. It's a simple utility I can run as a coprocess to my music controller so that I can map the input operations to my mp3 player. The best part is that since I use the Music Player Daemon (a.k.a. mpd), I can remotely control the volume and playback, I don't need to attach the powermate to the system running the mp3 player.
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