One of the tools of Art of Hosting is the World Café. In our training we used it, besides the Circle and Open Space. There is a User's Guide available for everybody who want to know more and maybe want to use the World Café in her own environment. You can download this User's Guide here.
The best way to know more about the World Café is to go to their website; it is beautiful and a lot of content can be read there. There is also a new video to watch...