Sony have added a little bonus to subscribers of their PS+ service. As of today, for two weeks only, you can download the Original God of War HD for free. As with normal PS+ rules, it is yours to play whilst you are still a subscriber. As far as I can tell, this offer is for PS3 owners in Europe, but I will let you know if the deal gets added for US gamers.
This is to celebrate the forthcoming release of the the next game in the franchise, God of War: Ascension, which is out next month.