Instructables
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.
 
 
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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

Step 2: Components

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To do this, you'll just need a saucepan and a metal bowl. Glass can work as well (with the added bonus of being able to see the boiling water through the bottom), but if you go this route you must be careful. Some glass bowls might not be safe to heat this way.

Step 3: Assemble!

Picture of Assemble!
Be sure the bowl fits snugly into the saucepan and only goes about halfway into the pan. You do not want the boiling water to ever touch the bottom. It is also important that you do not run the risk of the bowl sliding into the pan and mixing water with the ingredients you are trying to melt.

Most of the time when you are melting something, you will not use the lid. WIth the lid on, it is difficult to keep condensation from getting into the ingredients.

Be careful when you are using this - the bowl can get extremely hot! 

Step 4: Remixing

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Now that you know how easy it is to hack your own kitchen tools, you're basically unstoppable! Try using a metal colander instead for a handy vegetable steamer.

Step 5: Applications

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Or, just start melting to your hearts content. Make some brownies (with real chocolate!), or fudge, or my favorite pie: chocolate meringue. 

Photo courtesy of Steven Labinski: http://www.flickr.com/photos/texascooking/5805147477/
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. :)