Well, I decided to try making yogurt today for the first time--we'll see how it goes! I put the glass jar of inoculated milk in a cooler with hot tap water (about 120 degrees) and then wrapped the cooler in a fluffy towel as well; hopefully that will keep the temp fairly constant. I may check it a little later to see if any hot water needs to be added. Then, because I live with two roommates and it's entirely possible for somebody to be tempted to move the whole setup off the counter, I made a little sign saying "Caution: bacteria at work" and put that on top (I am SUCH a nerd...)!