If theres one game for the PSP that would encourage you to upgrade to a higher firmware or indeed buy another PSP its Grandtheft auto, the Hong kong Online store Lik Sang is taking preorders and has this posted on their site:
"This PlayStation Portable GTA edition is an all-new game set in the seedy, sprawling underworld of Liberty City, the New York-Chicago hybrid that was also the crime scene for Grand Theft Auto III. Developed by Rockstar Leeds in conjunction with the franchise creators at Rockstar North, you can expect all manner of adult felonies from car theft to robberies, murders and more. As has become a standard for the ambitious and controversial series, Liberty City Stories will shine on Sony's handheld with interactive, open environments, superb voice talent and diverse, cool music."