<<You can try The Extreme Kettlebell Cardio Workout by Keith Weber. >>
I ordered this last week (thanks to the enablers on this board }( )...can't wait to try it!
Susanne - Along the line of Jane's suggestion, check out New Jersey CrossFit's site for some really good ideas for KB workouts that keep moving.
http://www.newjerseycrossfit.com
They posted one a while back called "5 in 30" that I did yesterday. It was:
Do as many rounds as you can in 30 minutes of:
One arm KB swings 5R/5L
KB cleans 5R/5L
KB push press 5R/5L (I subbed KB snatches)
One arm racked front squat 5R/5L
Walkouts 5R/5L (I subbed KB get up sit up)
It was a sweet workout with no breaks!
Also, you could try doing something else during the 30 second breaks - jump rope, plyo jacks, walking lunges, endless possibilities...