I am not one of those people.
I am, however, someone who enjoys listening while I work - just not to music, or at least not music in the traditional sense. Specifically, I like listening to field recordings.
Here are two great sources of field recordings you can access today - if you know of others, let me know.
Visit The Wandering Ear and you'll find "a net.label dedicated to releasing field recordings from around the world. . .all available for free download in 192kpbs MP3 format." The list of their first seven releases can be found here.
Visit The Freesound Project for a searchable database of sounds, including wonderful recordings of my favorite "work sounds": rain storms and nightingales. Note - free registration is required to download any sounds. One neat function they offer is the ability to play and loop multiple sounds from the same screen, so you can enjoy the effect of combining sounds on the fly to see what happens.
Now get back to work.