Forterra, makers of OLIVE virtual worlds, along with ACS Learning Services recently conducted a proof of concept in employee training using their customized systems. It's a new approach to corporate dilemmas of training large groups for as little money as possible.
The experiment began with training the users on how to move their avatars to interact, thus pushing past potential problems with people being uncomfortable in the virtual space. They were then brought into the training environment where, rather than merely watching slides go by, they must move around and interact to find the answers to questions. How do they know the info got through? Tremendous feedback.