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Divx video to PSP format? 

Here are two guides for you:
1. How to convert dvd to psp:
http://www.daniusoft.com/guide/dvd-to-psp.html

2. How to convert video to psp:
http://www.daniusoft.com/guide/video-to-psp.html

You can also check on PSP Video 9 - Free PSP Video Converter