Any good work out videos?

My daily routine includes working out while the kids nap.  I love a challenging workout that really makes me sweat and incorporates some resistance training.  I prefer it to be about an hour long.  I have a lot of the tae bo videos, but was wondering if anyone has tried anything else that they really enjoy.  Thanks

I also work out while my daughter's napping.  I'm kind of bored with the treadmill so I'm excited to see the replies.  I used to love tae bo as well.  I know there's been a lot of discussion about Turbo Jam, but I'm unwilling to pay the money for the videos.  I like The Firm step aerobics, but you need to have their special firm box step.  The instructors are a little robotic, but I have yet to find a work out video where they are not.  I used to love the workout with Cindy Crawford videos.  She'd be sweating and out of breath and it made me feel better.

a friend passed on her 20mins winsor pilates DVD -- I LOVE IT!  in 3 weeks, my midsection has totally slimmed down!

I also bought a DVD for like $10 from walmart -- it's called

10 Minute Solution
Target Toning For Beginners

the workouts on it are:

* abs
* thighs
* buns
* arms/shoulders
* powerstretch

each workout is 10 mins.  the only equipment you need is a set of hand weights for the arms/shoulders workout (mine are 5lb dumbbells), and a towel that you use when you're doing the powerstretch

hope this helps

Thanks avasmom,  I looked into the Turbo Jam, and although it is a bit pricey, I think it was just the thing I was looking for.  Thanks again.