MySpace is holding an event in San Francisco tomorrow with 250 application developers to ceremonially launch its application platform…for developers only, that is.

Over the next month, developers big and small will have the opportunity to begin developing applications for MySpace using the company’s new, OpenSocial-based APIs. Until that month has passed, only a maximum of ten or so users will be able to install each app at a time, ensuring that the period is used strictly for development, testing, and feedback purposes. MySpace has also not given any developers first dibs to the platform and is thereby opening up a fair playing field to all. The applications directory won’t be rolled out, and the user cap lifted, until March when the platform is effectively released for users as well.

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