Here is our Kanban Board that we use at TargetProcess. We do not work on Tasks level, just on User Stories and Bugs level. Sometimes we create tasks, but they are not tracked explicitly on the board.
We do not estimate User Stories and Bugs, but try to split Stories into smaller (with mixed success). Columns are self-explanatory. We accumulate items in Tested column, then create a branch , smoke test it and release new build. Usually we release new build every two weeks.
Also the board shows developers and testers load and classes of services via color coding.
UPD. Now we have several small teams and use a single board to track progress of all teams in http://www.targetprocess.com/3
