PSP Go! adds a sliding screen that covers the buttons when the device is closed, and 16 GB of onboard memory. PSP Go! lacks a UMD drive in favor of downloadable content.
When the news first leaked about the new PSPgo model, it was referred to as PSP Go! (following the naming conventions of other PSP items that used the word "go," such as "Go!View" a tv-on-demand service).