A patent filed by Sony in November 2009 suggests the company has experimented with offering PS Move support on the PSP.
The recently released patent carries an image of a dock that houses a closed PSPgo. It features an in-built camera which works like a PlayStation Eye to detect motion controllers.
Whether or not this idea has been discarded or if it will be a potential NGP feature has yet to be seen.
Thanks to Joystiq for spotting the patent.