This week I discovered the website musicforprogramming();
It describes itself as:
“A series of mixes intended for listening while programming to aid concentration and increase productivity (also compatible with other activities).”
I’m only as far into the first (of seven) in the series, but it’s an excellent companion to working heads down on a project. If you are tired of listening to The Social Network original soundtrack while coding / debugging / troubleshooting / documenting, give it a try. Each mix is about an hour long. Here is their RSS feed and their subscription link in iTunes.