[Lutin]

I don't see how it would be useful.

If I'm doing something, I will switch to the new application.
If I'm doing something not on my computer, I will want to see what's next when I'm done, without to have to show it back.

For me it seems it's just a feature similar to Office, just for the fun (I like fun) that only get in your way when trying to use the tool (I hate that).

Beside, if you only hide the window (and not the application), you will still have to switch by yourself.

Maybe I missed something. Peter, you said you use this. How, and why?