The PSP, PSP 2000, and the PSP 3000. (I think that's what they are called.)
Nintendo also have made,
the Nintendo DS, DS light, DSi and the DSi XL.
They are also gong to be releasing the 3DS XL soon.
(Though I myself don't care for bigger screens, and I think the normal 3DS looks better. (If that matters. XD ))
The upgrades don't have more features then older versions, (though the DSi did had some new features over the DS/light.)
New versions usually upgrade stuff like longer battery life, bigger screen, it's lighter, etc. (Nothing huge, but it's nice.)
Nate, did I explain all of that right?
