An update to the PSP system software was made available today and it is especially useful for those with a PS3 system. Why? Because it provides new value added feature for your PSP – the ability to utilize (and resume the) save game files of a given PS1 game title (acquired via the PLAYSTATION®Network) on the PSP. Accordingly, new improvements from this firmware include:

GAME
★ Support for PLAYSTATION®Network titles has been expanded.
★ The ability to utilize save data for Playstation software on the PS3 and PSP has been added.
★ The method of managing certificates under [Game] has been changed.

UPDATE NOW AVAILABLE:
PSP Firmware 3.40: Japanese | US | European | Chinese | Korean