Hi Christine,
I use kettlebells. My favorite workouts are the Goddess Workout and AOS (Art of Strength) Providence workout. Many times I make up my own workouts and incorporate kettlebells.
If you are a beginner, you might want to check out Sarah Lurie and Lisa Shaffer. I know Lisa Shaffer has an instructional DVD that will help on form.
I was introduced to kettlebells while going to a fitness bootcamp. They are lots of fun.
HTH,