I am a slow cooker fanatic. I find it convenient and quick to cook great meals. It is also a great way to save on electricity. Depending on the size of your slow cooker and that of your oven, a slow cooker will use anywhere from 2 to 3 times less energy to cook a meal. The City of Seattle calculates that a slow cooker will use the equivalent of $0.10 of energy over 8 hours while a convection oven will use $0.32 cents in one hour. If you cool your house with an air conditioner the savings will be even greater: a convection oven produces a lot more heat that you will have to pay to cool if the air conditioner is on.
For great slow cooker recipes, I recommend the Allrecipes.com website. It is a great site as reviews often provide useful modifications or suggestions as to how to improve the recipe. It is also easy to find great recipes with a few basic (read cheap) ingredients.