As promised earlier, here's a one page quick reference describing some of the most frequently used commands in cdb / ntsd / windbg / kd.

The debuggers themselves are available at http://www.microsoft.com/whdc/ddk/debugging/default.mspx and include reasonably good HTML Help documentation.  However, the one pager is nice for learning and reference, particularly if you don't use these debuggers every day.

Send feedback if you find errors or have suggestions for improvements.