I am working on a new project together with a fellow modder. So the nintendo DS boasts dual screens???!!!!
Now the PSP also can support dual screens. We have put together a swivel screen system where the screen can be viewed in a traditional PSP way or flip upwards to be viewed like the DS way. When the screen is flipped up, you can see the insides of the PSP. To protect the inside mechanism, a plastic screen was used.
As you can see from the picture we are also working on a wifi antenna booster but although it is working perfectly it is not currently fully detachable so you have to carry it around. We are working on a system that will make it more portable. I will post more info once we make more progress.