I found this on Liesel's blog, and was intrigued. I've always been curious about what people really think of me. Not an uncommon thought, I'm sure. But this is an interesting device to discover just that.
Behold. The Interactive Johari Window and its counterpart, The Interactive Nohari Window.
If you decide to participate, perhaps the use of a nondescript, anonymous pseudonym would be in order. Something like "X1," so the next person can take "X2." That way, there will be no reservations about being totally honest. Just a thought.