Transactional Analysis gets thrown around a lot with Gestalt Theory. I don't use what people traditionally think of as transactional analysis techniques, but the empty chair technique is often used in transactional analysis (it's from Gestalt) and I use it quite often.
Transactional analysis is used a lot in the business world now-a-days.
My brain is too fried to get into great length. I will post more this weekend
