Portable Amplifier for PSP

Here's a lightweight solution to making your PSP louder: The PSP Amplifier.

This unit runs on two AAA batteries, plugs into your headphone jack, and clamps onto your PSP. The speakers extend above the unit from the back, but also fold away when not in use.

There's a good review at PSP411, where they basically say you get what you pay for. You can get one for $12.

(from PSP411)