Dual independent displays possible?

This may be more of a suggestion for Apple than a question since I'm fairly sure it's not possible currently. What I'd like to do is have my secondary display act as a desktop of its own. In particular I would like to be able to run a fullscreen program on one display and something else on the other. That seems to be completely impossible to do in OS X.
Does anybody know of a third party tool that could solve this for me? Or is there something that technically prevents this?

It's up to the application how full-screen works with respect to multiple displays. In writing the app, the programmer decides to use one of 5 strategies: explicitly pick a display (e.g., ask the user which one), pick the main display (the one with the menu bar), pick the secondary display (the one without the menu bar), pick the display with the best color depth, or pick whichever display the app already has a window open on.
DVD Player.app, for instance, will open full-screen on whatever display it was running on in windowed mode. What the Mac doesn't have is the notion of a default display, or forcing an app to open on a specific display (possibly overriding what the developer programmed into it).
One thing you might try, is to make the secondary display the main display, remove any preference file that might contain a record of where the app was last opened, and then run your application in full-screen mode, then quit out of it, and switch the monitors back. Some applications record the position on the display where they last opened and open back in the same place the next time they are opened. A fullscreen app could be trained to open on the secondary display in this way (presuming it "remembers" where it opened).

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