If you have access to a pool, Pete Pfitzinger has a great 9 week deep water running program. There has been some great research done on the effectiveness of pool running, it is worth looking into. Good Luck!
Case in point, my college coach Brian Diemer had a stress fracture before the '92 Olympics, did pool running like a crazy man, got out of the pool about 6-weeks before the Trials to get his "land legs" back, and managed to win Trials and then to take 7th in the steeple with like an 8:16 or something like that. We used pool running heavily in our program at Calvin, and even saw a few All Americans come out of "the deep". The thing about it is that since it is non-impact, you can work out hard EVERY DAY. It is mentally grueling, not to mention physically grueling, but people would come out with new fortitude.