A person by the Amir and ZuBiiKz have found the answer to all the dreaded questions, especially mine.
How to get MW2 to work on PS3:
YouTube - How To Make MW2 Play On KMEAW 3.55 CFW and other 3.55 CFW!!
Here is a descriptive video tutorial:
Tutorial taken from the official website:
File download: http://www.megaupload.com/?d=DX00I3Q9