Speaking in an interview with the Examiner, Naughty Dog co-president Evan Wells has said Naughty Dog would "love" to see Uncharted on other platforms, most likely the PSP.
"We’d love to see Uncharted grow beyond the PS3. It would be interesting to see what sort of changes to the design one would make for a portable system", said Wells.
He does insist that for now, the Dogs are "purely focused" on PS3 development.
Catch Wells talk more about Uncharted 2 and a possible Jak & Daxter for the PS3 through the link.