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Picture of Hack: Double Boiler
How to use kitchen equipment you already own to make a double boiler, rather than buying an extra kitchen tool.

Step 1: What Does It Do?

Picture of What Does It Do?
A double boiler is used to melt something like chocolate that is too delicate to be melted directly over a flame. They can be quite expensive but are easy to make using items that you probably already have in your kitchen.

Image courtesy of KVDP: http://commons.wikimedia.org/wiki/User:KVDP
 
One real issue witht he tight fitting solid bowl in the pan will be if it cools down it can suck the bowl into the lower pot and you might never get it out. I would suggest placing a butter nive or something between them so this does not happen.
This is the way I do it too - but with glass bowls. Very nice. :)