There is a program called Showcase over at xda that does almost exactly what you want and more. The thread is located here:
http://forum.xda-developers.com/showthread.php?t=530564
Also, there is a program called Task Facade as mentioned above that can be linked to a button on your phone to switch to it and view/switch between running tasks. TF can be found here:
http://www.freewarepocketpc.net/ppc-...sk-facade.html