Sony Shows Wireless Multiplayer, Talkman, New Games For PSP
Thanks to GameSpot for its article discussing Sony's showcase of new features/software for its forthcoming PSP handheld, including confirmation that "up to 16 PSPs can connect together using the device's wireless LAN... without the need of a central hub device", as well as "several new PSP games, including a version of the anime-inspired PlayStation 2 shooter Ghost in the Shell: Stand Alone Complex... [and Harvest Moon and Need for Speed conversions.]" 1UP has further information and pictures, including the unveiling of Talkman, new PSP software which "accepts voice input from a microphone peripheral.. [and lets] a multi-lingual cartoon bird named Max... translate comments in one language into another."
Apparently Sony has enough know-how to accomplish those requirements around small disc and portable player, as tested in MiniDisc that has a sizable market in Japan. Google "battery life" and "minidisc", and the figures are not bad. In PSP you have to consider cost of running games in a large LCD, but it won't be much higher than GameBoy - like 2 times or less power consumption.