I've never believe in press release submission for SEO. I dont know but I culd get good ranks for several of my sites without any press release. But recently I talked with my AM in MoreNiche (for one of my affiliate campaigns promoting them) and we were talking a bit about SEO and he mentioned that most of his own traffic come from search engine and one of his best technique is press release. I wonder is press release really help in terms of SEO? And if yes, do we need to create one press release every month or just once considering the next press releases will still be submitted to the same sites?