Annie, I'm just getting back into running myself after my accident. My doc suggested that I walk a bit, then add 1/2 mile, but i need a more structured plan. I used Cool Running's Couch to 5k a few years ago, when I first started running, and I think I'll use it again. You are probably much more advanced than that, but it's worth checking out

http://www.coolrunning.com/engine/2/2_3/181.shtml

jeannie