For right now you can use a program called usbhostfs running on your PSP
You install irshell on your PSP
Then you can plug a usb cable to your PC and run movies, games, music all from your PC
The problem for right now is you have to be tied to your PC to make it work.
But this will give you a solution that will only take an hour to setup and you do
not have to do any hardware mods
We are working on portable solutions to this problem, but right now I would
recommend that you use this solution till we get further on our mods.
This is simple straightforward and is the best first solution for you
You can read more about it by going to:
http://www.irshell.org