I am in the same boat as Artist of Eyes. I'm short so it's hard to use the Bosu for step workouts, and after I got the Step 360 I liked it so much better. My Bosu has been sitting in the garage unused for ages. When I had physical therapy last year I noticed that they use them for some purposes at the PT place I was going to. Maybe if you're thinking of donating it you could give it to some place like that.
If you guys otherwise can't find homes for your BOSUs, please consider finding a ballet studio to donate them to if you have one nearby. That's where I sent mine to live - they use it for strength and conditioning, as well as some PT exercises.
I'm surprised to hear they are used for knee therapy since it seems to bother my knees. But that was when I did cardio on it. Perhaps that's not the best use for it?
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Jumping for joy is good exercise.
I think bosu's are great for improving balance, and excellent for working the core. I do tons of kickboxing, and find the bosu improves my kicking. Hopefully, once I get one, I will actually use it more than a few times, lol.
Mindy has a lot of new DVD's that use the BOSU, I just got a couple more during her sale in hopes of continuing to incorporate it into my routines. I admit is has been collecting dust even though I have some workouts that utilize it.