Why do I get blisters from running and how do I prevent them?

Ever get those nasty blisters after a long run? Why does this happen? You wear the same socks and running shoes you usually wear but then....bam...nasty blisters. After years of meticulous research into my own blisters, I came to realize I only got blisters when I ran faster! The biomechanics of landing farther up on my midfoot then pushing off harder made me have blisters. So, I figure either run slower or endure! Since that wasn't a great anser, I tried all kinds of lubricants and socks. My best combo is blister free "Wright Socks" and my friend "Body Glide". Now I can run fast and beat the blisters!