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The video of the campaign hack is floating around the internet...and it may be possible on PS3 as well.
In Linux, if you go to "Computer" you can view the blu-ray disc that is inserted in the PS3 and edit it (to edit them you have to do a few things to your permissions on Linux)
If the XBOX360 tutorial was given, it would be possible to hack Modern Warfare 2 on the PS3, because most of the files are the same.
Certain sites also say multiplayer hacking is possible, if another .FF file is edited.
Note: CVARS ("console" commands) are gone from MW2.
Note: DVARS still exist, that is how the campaign mode was hacked. There are tons of them that were converted from CVARS, such as godmode.
DVAR lists are probably somewhere on a PC MW2 board, and I could easily find them.
If someone finds the methodology on XBOX to hack Singleplayer / Multiplayer, please drop me a line...
--Michael