Originally Posted by 4DoorITR
AFAIK none are.
I thought I had read somewhere that they were: just found this quote on PSX scene from 06-21-2011:
I noticed that the Resistance game has files called "Auto_Generated_Padding_x.bin" (in this case "x" goes from 0 -59). There are 60 of these files (counting "o") and they are located in the "BCES00001\PS3_GAME\USRDIR\packed\movies\muxed\nts c" folder. In total, they make up 1.87GB of extra space.
I think you are right though, most games arent padded out.