I do bits and bobs barefoot, and I enjoy the liberating feel of it (it's even got me minimalising in other areas,) but it has to be said that bare feet do not grip well on some surfaces, such as moorland grassy slopes, and it is VERY easy to hurt your toes and stuff. I reckon the real point of running barefoot, for me, is that it shows me what running is supposed to 'feel' like, in terms of correct foot strike. Once I worked out how it's supposed to feel for my body, I can make sure I run that way in shoes.
But, like someone else here said, you don't ever want to be in thick soled, built up heel jobbies. That's why I fancy some more minimal shoes.