Kerry I'm doing the great2run course at the moment. It is good, a bit repetitive in some of the assessments, but I'm finding it really useful. It doesn't matter where you are in your training, you just input your data - mile times, goal etc and it can give you a schedule, or you can create your own. I'm not using the training schedule at the moment as it told me a hlaf mara was a bit unrealistic :(, but then I did start from absolutely nothing! Also there's 9 learning zones, for the assessments.
If there's anything you want to know, drop me a line - I'll help if I can.