A few weeks ago, we saw the advent of a de-hydration hack on Windows Phone that seemingly brought fast-app switching to the OS (and despite claims, we didn't see a hit on battery life).
Now the same hacker, Jaxbot over at Windows Phone Hacker, is bringing it to the next level by adding on an app-switching program to the mix. In short, this brings near full multi-tasking to Windows Phone well before the 'Mango' update, expected this fall.
By utilizing the camera's half-shutter button, a user can bring up a nice UI that allows one to now choose between apps that are "running" instead of just using the back-arrow or "re-launching" the app from your Start screen. Of note, this is just a 'preview' meaning the design is still in development and things can change as it progresses. Either way, we're stoked:
...the application is triggered by pressing the half shutter button (pressing the camera button halfway, not to the point where the camera would launch), and allows the user to jump between desired applications. The applications run in the background to a degree, as shown with the timer, and no time is required to bring the applications back from their background state. It's all very technical, but rest assure that he will be sharing some more details in the future.
Keep in mind the application is a preview-the interface and how it functions may very well change before release, and no release date is available. But if you're interested in having it on your device, share some thoughts about how you think it should look, function, etc, in the comments below.
Very cool stuff. Stay tuned for more as this develops. Of note, you will need a developer unlocked device to have this work when it is finally released.
Source: Windows Phone Hacker