Several trailers of upcoming PSP games have been uploaded onto Sony's PlayStation JPN servers.

Available on this page, you can find trailers for several games, including Ratchet & Clank, PaRappa the Rapper, and Ape Escape Racer.

On the page, there is also a trailer for an upcoming PSP rhythm game (currently titled P-kara) which will feature downloadable songs. No word on the pricing of the songs.