Sony made much ado of the PSP's position as one of the first online gaming consoles, but unless your idea of online play involves Skype calls, there hasn't been a lot to go on since 2004. Team PRO is addressing that deficit through Prometheus, a completely community-driven rival to PSN. The hack lets PSP games with support for ad hoc WiFi play go online by wrapping the normal local-only multiplayer in an emulator library that broadcasts to other Prometheus players. It requires a second-generation or newer PSP as well as a wireless router that can expose the PSP in DMZ mode, but there's a live who's-playing board and even an in-game chat mode to coordinate that round of Fat Princess as it happens. Of course, using a wholly separate gaming network outside of Sony's rubric involves a whole lot of warranty-voiding risk; if you're willing to live on the edge, though, Internet games of Metal Gear Solid: Peace Walker or Pro Evolution Soccer 2012 will let you put off that possible PlayStation Vita purchase for a little longer.http://www.engadget.com/2012/06/01/psp-gets-its-own-homebrew-online-gaming-network/
Anyone going to give it a try? There were a number of PSP games (Star Wars Battlefront II, The Warriors, Grand Theft Auto, etc.) that I would have loved to play online on my PSP but they only supported ad hoc.