Ok there seems to be some confusion in the comments here regarding trophies so let me clear it up, it is mandatory for all new releases on PS3 to include trophies much like it is on Xbox with achievements. Here is a quote from when the story broke almost 2 years ago now;

a Sony Computer Entertainment Europe spokesperson confirmed that this information is accurate, stating: “Yes from Jan 09 all games must have trophies.”

Only games released before January 2009 don’t have trophies, of course some like Uncharted and Super Stardust were patched to include them but this has not been the case with many other titles, particularly MGS4. So there you have it, any new release will have trophies, including PSN only titles and platinum trophies can only be obtained in full retail games. If you need some help hunting them down try out ps3trophies.org for some advice and the forums for help.

PS3 Trophies to be mandatory from January 2009 [Video Gamer]