barefoot running?

I've been reading a lot over the years and especially lately about barefoot running.  Joram showed me be the Vibram Five Finger running shoes awhile back and now I'm seeing or hearing about them everywhere.  And I must admit- I'm totally intrigued!  I'm considering getting a pair to wear for the rest of the summer and into the fall since I'll probably need new running shoes soon anyway. I've been noticing my feet are cramping more than they used to and blistering a lot too. I'm wondering if it has to do with my shoes even though I wear several different brands and styles to help mix it up.  Running... one of the simplest and purist forms of exercise has gotten so complicated!