I've been transitioning into minamalist running shoes after developing PF. I tend to run in them twice a week, both easy and shortish runs (max four miles so far).
Last weeks total mileage was 47 miles, so the PF isn't holding me back; it tends to burn my heel to begin with, but once I'm warmed up, it's fine. When I sit at a desk - like now - it sometimes burns too.
Does the barefoot running help? I don't know. Sorry. I've done some extensive interweb based research on PF (I know I know) and it seems there's nothing definate. Mrs Easy is a quality standard club runner and she developed PF after about 10 years of running, she didn't do much to treat it, though she did reduce her mileage and eventually after some months it cleared up of it's own accord.
Had she had/used steroid injections/orthotics/golf ball massage/frozen bottle massage/spints in bed, etc, I bet she'd swear those things worked; but she did none of it.
It's tough to find a sure fire cure for PF, but if you run properly in barefoot trainers, transitioning carefully, I doubt we'll cause further damage; very little impact happens on the heel with a forefoot landing; the heel just kinda touches the ground.
Disclaimer:
I'm a Geordie and no expert; don't trust what I say.
Edited: 17/10/2012 at 00:15