My mins boggles with all the crunches!
The 30 day shred is an exercise DVD by Jillian Michaels (one of the Trainers on the US Biggest Loser). It has 3 levels so ideally you do level 1 for 10 days, then 2 for 10 days and then 3. They say that if you do it every day for the 30 days you should see dramatic weight/inch loss. I'm due to to day 10 tonight and i've already lost 4.5 inches, though the weight seems to be stuck.
If you put "Jillian Michaels 30 day shred" into a search in youtube you'll get some highlights of the DVD. It's really tough but i'd totally recommend it and so would my shrinking belly!