...Unless you're faster than me, in which case, I have nothing of value to offer you.
...But if you're faster than me, and injured, there be a small bit of value in what I'm saying.
...If you're slower than me, you might only be slower because you listen to too many people. Stop reading so many magazines and ignore the forums. You should add "don't listen to me" to that list as well (other than following the advice in my previous sentence).
...If you're slower than me, and injured, man... that just sucks. Go see a doctor. Don't worry about an ironman; worry about being able to walk when you're 50. Then worry about running a 5k without getting injured again.
...If you're about my speed, listen to everything I say: read all the magazines, follow every piece of advice on the internet forums, ignore your doctors and spend as much time as possible researching and then purchasing the best gear imaginable (like this or this).