I've discovered that you can cook potatoes, sweet potatoes and such things in the slow cooker. Just pierce them and throw as many as you can into the slow cooker, turn it on to low and let them cook all day. They come out very like they do in the oven, and for me it saves a bunch of money since I only have a small 4 bar tabletop oven.
And yes you read that right. You don't need any liquid to cook them in. They will create their own steam as they cook. The wonders of modern technology.