Have a cumulative flow diagram for Kanban (Scrumban) boards
Instead of (or additionally to) the burndown chart, in Scrumban, it will be very helpful to see a cumulative flow diagram that shows, for each day (or week) how many issues/user stories were in each column. This will give a lot of info about the way the team is working and the flow.
Cumulative Flow Diagrams are available at Yodiz
Yodiz Support Team