The iPad doesn't have multitasking yet, but if you have an iPhone or any other smartphone, this non-destructive HUD adaptor is for you. It's easy to make: you just need a U-shaped plastic extrusion, scissors, a Dremel tool and superglue.
Cut the extrusion in half, shape the halves in the way you want with the Dremel, and glue them with the superglue. Wait for them to dry, paint the result in jet black and you are done: put it on the iPad, place your iPhone on top, and boom, instant HUD.
I know, I know. MAGICAL. [Geeky Gadgets]