Hey there, I have a barefoot farrier. She doesn't do shoes at all, and practices exclusively barefoot practice. I have four horses, three of which are OTTBs...and none of them have had shoes in ages. If you do need to go out and do hard work, such as jumping or intensive trail riding over hard ground, you can buy special boots to put on your horses feet. Generally, however, they do find whithout anything. Horses weren't designed for shoes, and they were designed for going over hard heavy going.
My farrier has been barefoot trimming my horses for over a year now, and my horses have never looked better. They are consistently sound, their feet look great, and they are in overall wonderful condition. One of my TBs had a bowed tendon when I got him, mainly from his 'racetrack trim' he had no heel, a long toe, and his walls were in shambles from the shoe nails. Now, his feet look so great that if I showed people photos of just his feet, they would never guess he had raced for 5 years.
If you need anymore information on barefoot trimming, please feel free to let me know. I would love to help you out; my horses have never looked better and I'd love to pass it along!