OK so I copied the title but it fits in so well
Sega there you will find:-
Playstation 2 Games Manuals
GameCube Games Manuals
X-Box Games Manuals
Dreamcast Games Manuals
Dreamcast Hardware Manuals
Square-Enix there you will find:-
Playstation Games Manuals
Playstation 2 Games Manuals
Note:- Support then downolad owners manuals (direct linking to the page did not work)
Advance Power there you will find:-
GameBoy Advance Games Manuals
I know there are plenty of other sites out there, so lets list them in one place