I'm really stupid and I've been injured probably eight garpskrillion times, so I know what I'm talking about.
1. Run your easy days easy.
1.5. No really, run your easy days ACTUALLY easy. If you are paying attention to your pace, you're probably not going easy enough. I know you think you need to run 6:30 pace to reassure yourself that you're a good, brave, fast runner, and you've somehow managed to convince yourself that you can recover at this pace, but you're wrong.
1.75 I sense that you still aren't completely sold on the idea that you should run your easy days easy. But seriously. Do it.
2. When in doubt, don't be afraid to take a day off or push a workout back a day or two. You'll benefit much more from consistent training over a LONG period than consistent training over any isolated stretch of time (in other words, it matters more how many miles/workouts/races you run over the course of a year than how many miles/workouts/races you run during any given week).
3. Cross train before you need to. I skate ski in the winter and do the elliptical when there's no snow on the ground. And if I'm getting back into running after time off, I force myself to cross train every other day or every third day even if I feel like I could run.
4. All those little strengthening exercises that your ath. trainers/physical therapists tell you to do? Do them. All of them. As many times as they tell you to do them. Even clam shells. No, ESPECIALLY clam shells.
5. Walk to keep your legs loose. My car broke down twice during college. Once for about a year and another time for about 6 months (I was super poor and didn't have enough money to fix it). I had to walk to get coffee every morning and walk to campus (about 3 miles total spread out over the day). Despite how monumentally stupid I was being with my training, I was still relatively injury free during both of those time periods. I only realized the correlation retrospectively, but I've been playing around with the idea lately and so far it seems to yield similar results. I don't know if I'd recommend adding three whole miles of walking, but one mile with my dog in the morning seems to do the trick perfectly.
6. Pay attention to the camber of the roads you run on. Try to stay off cambered roads as much as possible.
7. If your pelvis is all whack and out of control, take measures to make it be the right way instead. Do even more clam shells than you were already doing.
8. In workouts, try to shift your pace more smoothly. You aren't trying to set a world record in the 100 (or maybe you are, in which case, disregard), so there's no reason not to allow yourself a bit of acceleration into your top gears. Just three or four steps of transition is all it takes.
9. When in doubt, wear tights. If really super in doubt, at least wear knee socks.
10. Be patient. Be realistic. If you're very honest with yourself, you can tell when you're about to be a raging idiot, and you can stop yourself before you ruin all of your goals. Learn how to say "no" to yourself when there's a possibility that you're being a raging idiot.