"Use a PC or Mac to download software from PSPbrew.com that lets PSP emulate old
consoles. Unzip the file to get the PSP folder on the desktop. Search Google or
a P2P network for games using the keyword ROM, like so: "ROM Mario." Copy the game to the PSP folder."
"But I'm not talking only about emulators. There are homebrew apps to help users
tune a guitar, grab local weather, and read PDFs. PSPBrew.com is the ultimate service for the lazy, offering customized zip files containing whatever apps you want. There isn't a better service on the web for any other platform, and this is within a year of the PSP's Japanese debut. Just imagine where homebrew apps on the system will go!"