I used Media Go, and did some of the tricks to get an unsupported video files to work on my PSP.
This is all my steps that I did, when I first got my unsupported video files to work on my PSP. It works 100% with all my video files onto my PSP Portable
Things you will need:
*Media Go Download*
*Keep Vid for downloading Youtube URL Videos*
Go to Youtube, and find your favorite videos you like. Then hit right-click on your mouse, and copy the Youtube URL