The ePSPSDK is an upgrade to the original Minimalist PSPSDK. The original SDK is quite outdated now, the ePSPSDK project aims to update the MinPSPW SDK and to add PSVita and PSP inter-operation.
One of the main aims of this SDK are to provide the ability to make homebrew which change their behaviour based on whether the application is running on the PSP or the PSVITA. It also plans to provide a platform for developing PSP homebrew for the PSVITA without actually using a PSP for debuging.
28th December 2012 :
*OSLib is outdated and has been replaced by Glib2D by GeeckoDev SOURCE: https://github.com/GeeckoDev/gLib2D
*Detailed documentation is under development at http://pspsdk.wikia.com/
*Began development of the BUGSPRAY debugger for eCFW - Code not included
*Began development of inter-operation functions - Code not included
The project can be found at The official website