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/
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