Upgrading the PSP browser

From this Gamespot article

The PSP-3000 plays the same games and offers the same media support as the older PSP models

So all the games are backwards compatible.

From Wikipedia

the PSP-3000 ... has an improved LCD screen with an increased color range, five times the contrast ratio, half the pixel response time to reduce ghosting and blurring effects, a new sub-pixel structure, a microphone, a new disc tray design, new button designs and logos, and anti-reflective technology to improve outdoor playability. It can also output all games by component or composite using the video out cable.[77]

So it's better. The biggest improvements seem to be the reduced ghosting (which still exists but is well, reduced) and the anti-reflective technology.

The Wikipedia entry for the PSP has detailed hardware specs. Things to watch out for:

• PSP Go has no UMD drive
• PSP 1000 has no video out, the more recent models do
• PSP 1000 gaming controls aren't quite as good as the more recent models
• some accessories may only work with a specific model of PSP
• PSP hardware is region coded (represented by the last digit of the model number), as are most UMD movies and some games