Here's a good app i have found you can configure your pc to use the psp as a second screen
This program package lets you use a Playstation Portable as an additional monitor in Windows.
You can also remotely send mouse commands to the PC.
PSPdisp is compromised of four components,
Windows a display driver,
an usb driver
and the interface application which captures the screen, compresses it and sends it over USB to the PSP.
On the PSP side there is an application that decompresses the frames and displays them.
Requirements
all firmware apart from, 5.50 GEN-B or homebrew enabler (working on ChickHEN R2 and CFW Enabler 3.60).
website link : jjs.at/software/pspdisp.html
+ rep me plz