If you're powering on your PSP, you'll be pleased to know a new update has surfaced. This firmware update 3.10 adds additional PSOne software compatibility and also a new audio feature for the PSP – a dynamic equalizer that I'm not quite sure has a purpose. Sony says the equalizer self-adjusts to varying levels of audio from movie, games, and music. There's also a memory conserve option built to help the internal browser's performance.
Lastly, check out the 25MB Killzone: Liberation demo that Sony put up on the official PlayStation site: Us.PlayStation.com.