Debugging Crash Dumps with Visual Studio 2010

If you're visually oriented, you need to check out this video, with escalation engineer Tess Fernandez showing off some very nifty debugging features, including the ability to work with managed-code dump files and the "thread aggregating" stack views. See the whole thing, or jump to ~2:10 to get the dump, ~3:20 to open the dump, ~6:40 to view the parallel callstacks.

For more on the parallel stacks view, this video is your friend.