I used Robert Ullrey's too, since I really like trance, but it's easy to make your own. It took me about an hour to knock the first weeks of bridge to 10k out with my own music.

I used garageband, but I'm sure there are a million ways to do it.

If you have an iPhone, there's an app that allows you to play voice cues over your own music.

If you don't, you basically create your own podcast. I can only tell you how to do this in GarageBand, which may not be that useful if you don't have it.

But basically, I recorded myself giving the walk/run/etc cues, then dropped them onto a timeline so that they came in at the right intervals, and then dragged in the music I wanted to use.

I'd look for some kind of "make your own podcast" software and do it. Then export it to iTunes, copy it across and you're ready to go. It is a little weird having myself tell me what to do, but I needed to e in control of the music, and this was the easist way.

I also used Ullrey until that week there was no intervals. SInce then I run with my own music. Either shuffle or make a playlist, mix it up in Mixmeister.

The app is: http://www.c25kapp.com/