this is bundled with the game along with pre installed songs from the game, along with other extras like special outfits and such.
go here
http://psp.ign.com/articles/108/1089179p1.html
it looks pretty sweet, and i am going to buy it for sure! , though i thought its was going to be THIS Walkman when they announced it.
but i guess i was going too far , since that would probably be more expensive than the PSP itself.
I live for the burn...and the sting of pleasure...
I live for the sword, the steel, and the gun...
- Wasteland - The Mission.