If you're one to melt chocolate in a double boiler, take a look at this Double-Wall Pot ($16, Fresh Finds). The stainless steel 1-quart pot has an outer insulating "water jacket;" pour water in before heating something delicate, like chocolate or custard.
Up side: you don't have to mess with two pots or an extra bowl. Down side - we can't think of one yet, other than the expense of buying a new pot. Brilliant idea or a one-use tool - what do you think?