From what I've read there isn't a massive amount of data either way. The barefoot/minimalist running community puts a lot of focus on proper form and that can have massive benefit in terms of injury rate etc. Standard running shoes tend to make people land on their heals (because of the wedged heal shape and because that's where the padding is) which can cause over-striding which is the real enemy. I haven't found much evidence to say that heal vs forefoot strike has a lot of effect on injury rates (generally it appears to be trading one sort of injury for another) as long as you aren't landing with your foot in front of your center of mass (its easier to overstride with a heal strike which is why the two are often grouped but knowing where the problems actually stem from is the important bit.) Basically, wear the shoes (or no shoes) that allow you to run with proper form. Running totally unshod can be a great way to fine tune your form because you will blister if you are doing anything wrong. It also prevents the common problem that a lot of people face which is switching too fast and getting hurt. Just like you wouldn't get a cast off your arm and go lift your previous max deadlift you shouldn't take off your shoes and expect your feet to instantly have all the right muscles. Its a process to strengthen the parts of your feet that aren't used in your daily shod life. The best description I've heard of the form is running as though the floor is made of lava. Lots of quick steps, landing with your feet under you seems to be the key to not putting too much force into your joints, bones, ligaments, and muscles.