http://www.agileproductdesign.com/blog/2009/kanban_over_simplified.html
".....Kanban development distilled
Kanban development revolves around a visual board we use for managing work in progress. (Not surprising since Kanban means visual board). It’s common for Agile teams to put the stories in a current time-box on a board with columns for the stages stories go through such as “development” and “testing.” The Kanban board is similar — with a few more rules........"
"...This board was reconstructed from photos of boards used at Yahoo. ..."