I love starting my day with a good workout. I usually go to an early morning boot camp a couple of days a week. If I am working out at home I like using kettlebells. You can get a good strength and cardio session using these. A couple of workouts I have done are from Jillian Michaels and another from Whole Living magazine. Jillian gives you great tips, like the power to raise the kettlebell comes from your legs and core, more than your arms.
I found a couple more good workouts from Self and Fitness magazines.