Instructions:
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1) Move the 'seplugins' folder to the root of your Memory Stick (edit vsh.txt if you have more plugins).
2) Move 'game_categories.prx' all the way up in vsh.txt if you want to make sure proper compatibility is maintained.
3) Reboot your PSP and go to your System Settings menu, a new option saying 'Game Categories Mode' will be there.
4) Select one of the three modes:
- Multiple MS: A new Memory Stick icon will show up for each category you have.
- Content Browser: This complete replacement for the menu is based on patching of the Photo modules.
- Context Mode: This will show a context menu when you go in to your game menu where you can choose the category.
5) Create new folders in /PSP/GAME, /PSP/GAME150, /PSP/GAME5XX, /ISO and prefix them with 'CAT_', fill them with whichever you want in them.
6) If you have two categories with the exact same name in two different folders, they will be merged together.