I doubt that there is, but let me explain what I would I am looking for. What I would like is to use dual monitors but keep the screens independent of each other. For example, say I had iTunes on my secondary display. I want to be able to switch between spaces on my primary display while keeping iTunes on my secondary display. Currently both displays act as a single space so when you switch to another space both screens switch. Say I had 4 spaces. What would be even better is to have Space 2 on my secondary display, and switch between 1,3, and 4 on the primary. Then, if I moved my mouse cursor over to the secondary display, I would be able to switch between Space 2 and whatever other two spaces are not being utilized by the primary display. At least for me, personally, this would definitely increase my productivity. I hope something like this actually exists and I am not just dreaming.