Runners...Links you want to reference again and again...

Pace music
http://www.djsteveboy.com/podrunner.html

Interval training and couch to 5k music
http://www.djsteveboy.com/intervals.html

Calculator
http://www.mcmillanrunning.com/mcmillanrunningcalculator.htm

Cadence chart to help with your pace decision
http://www.run2r.com/Technical+linking-bpm-to-running-speed-usa.aspx

And the article to educate you on bpm...
http://www.selfgrowth.com/articles/sundquist.html

For the endurance runners...
http://www.halhigdon.com/marathon/Mar00index.htm