Jackie,
I got one in February. I started using it, and then got sick and haven't gotten back to it. I have several DVDs that I ordered for it: two cardio with Rob Glick, one strength with Gay Gasper, and a yoga based one (I can't remember the instructor). One of the Rob Glick cardio workouts is 30 minutes, the other is 60. I've done the 30 minute workout, and found it to be a pretty intense 1/2 hour. I've also done the Gay Gasper DVD. It was pretty good.
I also ordered the Mindy Mylrea Explode/Keli Roberts Burn DVD. I've only done the abs from Keli's workout. Both of those workouts look like they'll be fun. Finally, I got a Stott Pilates tape for the Bosu and enjoyed it.
I got my Bosu in part because of posts on this forum about doing Cathe's ab work (like from C&W) on the Bosu. I'm hoping to try that soon. I've just been getting back to Cathe's strength and cardio over the last week, I hope to work the Bosu back in in the next few weeks.
BTW, you can always use it while you do other strentgth work, for instance, squats on the Bosu, or stand on it while doing upper body work.
Sorry, I know that was a long response!