Just wanted to confirm (as this came up in an earlier post): the 10k training plan on Runkeeper is only free for the first three workouts, that is, the first week only. After that you have to buy a monthly or yearly subscription to continue to have access to the program's workouts.
I did the first three, and they were all interval training, which got a bit monotonous. Another thing I didn't really like was that you can't see what the future workouts will involve until you've done all of the previous ones. I prefer having a bird's eye view of the whole plan!
I'm looking forward to going back to the NRC 10k plan!