Short workouts

What workouts do you do, when you have little time but still want an effective and not easy workout?

Like today - I had exactly one half hour to workout after early mass ( Our Lady of Fatima) and before I had to go to work meetings. I chose Jillian Michaels' Biggest Winner Cardio Kickbox - fats paced kickbox and calisthenics, bootcamp in feel.

So my list of short but not easy workouts are ~

Jillian Michaels' Biggest Winner series - Cardio Kickbox, Shape Up Frontside, Shape Up Backside - all bootcamp style
Jillian Michaels' 30 Day Shred - any level but especially levels 2 and 3 - circuit training
Turbo Jam Fat Blaster - four turbos, each done low impact then high impact.
Turbo Jam Cardio Party Remix - fun music, high impact danbce and kickbox, two turbo drills.
Cindy Crawford's Shape Your Body Workouts 1 and 2 - weights, low weight, high repetition, great music, great production.
Turbo Jam Kickin' Core - just the 30 minute high impact cardio section...
Taebo Cardio Circuit 1, with light weights
Taebo Original Bootcamp 1
Taebo Abs and Glutes ( ouch, is all I can say!).
Joyce Vedral's book workouts, to my own music - Definition or The College Dorm Workout or The Fatburning Workout ( all weight workouts).