The PSP 4.0 Firmware is out. But for those expecting holographic projection and Nintendo DS destruction mode, don't get too excited: The main features—at least according to the official change log—are the internet search option under the network menu, and playing with the video playback speed using the up and down buttons. In any case, you can judge for yourself seeing the PSP 4.0 firmware in the video walkthrough.
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We all finally have a reason to turn on our PSP. Neat.