If you're looking for something to get you going, I'd highly recommend this program. The intervals are well spaced and Robert, the instructor, is a good motivator. The music wasn't so much my taste but I found myself not even listening to it and just thinking of about things I needed to get done.
He mentioned making a half-marathon podcast and while I don't think I'm ready for that, I do plan to gradually add to my routine just to keep pushing myself. I never thought I'd be saying those words. Of course I also didn't think it was possible for me to run a mile, let alone 3! Oh and the podcasts are free, so you have no excuse!