released the first public BETA of his PSP motion kit driver today. The driver, which currently works on custom firmware 3.52 M33 and below, allows users to take advantage of motion sensing functionality either in the XMB or in games provided that you have the PSP motion kit installed.
Download: Motion Kit Driver v1.0b & SDK BETA
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Also included in the release is a software development kit for the driver, allowing homebrew developers to interact with the motion kit driver in their applications.
The author notes that a final version of the driver should be ready soon, complete with support for custom firmware 3.71 M33.