At E3 2007, Sony released information that a new version of the PlayStation Portable, known as the PlayStation Portable Slim and Lite. The new PSP was 33% lighter (reduced to 189 grams from 280 grams) and 19% slimmer than the original PSP system. The model numbers have also changed to PSP-2xxx, following the previous region-based numbering scheme (cf. the PSP-1xxx numbering scheme of the "old" PSP model).
Better Wi-Fi connection
Faster loading times by storing UMD data in temporary memory.
Internal memory (RAM) increase from 32 MiB to 64 MiB
Improved battery life due to lower power consumption, and battery recharge over the USB data connection. However the old, higher-capacity PSP battery will still be compatible and using it will give an increased battery life, but the battery cover will not close when using the old battery due to the larger size.
Weight has been reduced by 33%
Unit is 19% narrower (slimmer) in thickness
A video-out port for displaying on a TV.
Improved responsiveness of d-pad and buttons, confirmed in the GameSpot "hands-on" review; "several GameSpot editors have noticed that the d-pad and buttons on the new PSP provide a little more tactile feedback for a better overall feel."