I have just discovered that Eric Mack blogged a little on my Knowledge Cafe at KM World. There are a couple of nice photos including one of the "knowledge circle" at the end of the k-cafe. As Eric notes, I took some video of the circle which I really must process and post on-line. The circle is a lovely way to hold the whole group conversation phase of a knowledge cafe.
Eric also ran a Knowledge Worker Productivity Workshop with Steve Barth at KM World.