Sony has submitted the UMD optical disc as an official standard for movies and and software, allowing other companies to produce content that will play on the Sony PSP (as well as new devices that would support the format). The 1.8GB discs aren’t a bad format, but it’s impossible to say what desire other companies have to produce movie playback devices that use a rotating optical disc standard (especially after paying licensing fees to Sony). Nevertheless, MiniDisc was popular in Japan, and it is similar, and it does mean it’s much more likely to see movies and other content from studios that aren’t named “Sony *”
Sony Considers Opening PSP [PCWorld via PSP411]