P90X
An extreme 90 day home fitness program. It includes everything you need to get ripped in 90 days. There are 12 workout videos to keep you challenged and a comprehensive nutrition plan. Warning: Not for the faint of heart. With this program, be ready to completely overhaul your diet and workout at least an hour 7 days a week. I recommend passing their fitness test before you order this program.

The Firm
The Firm has been around for decades offering workout videos based on the philosphy that a combination of strengh training and cardio intervals is the best way to get results. They offer workouts from beginner to advanced. Some of the older videos are a bit dated in terms of back support (it's easy to spot them by the wardrobe), so be careful! All the instructors are friendly and give good instructions and all the videos will give you a great body workout.

Cathe Friedrich
Catch her shows on Fit TV. She is in amazing shape and she takes you through the workouts that will help get you there too. You can get the workouts on TV, but I recommend buying the video so you can do your workouts commercial free.