inFamous was first revealed at E3 2007 (http://ps3.ign.com/articles/803/803511p1.html), and it definitely was in development before that showing. Meaning, the time of beginning development for the game overlaps that of the release Crackdown. So unless Sucker Punch had informants at Realtime Worlds before Crackdown released to tell them what was up, then no....I'd say that Crackdown didn't influence inFAMOUS...just a coincidence that it's an open world game based on super powers. Just like Prototype.
http://ps3.ign.com/dor/objects/800208/sucker-punch-project/videos/infamous_e3trailer_081107.html
^E3 2007 trailer....and those graphics are boo boo lol








