I have experienced a slight drop in my main website rankings and I was mainly using Press releases and a combination of wordpress blogs. On the wordpress blogs, I mainly structured them like mini websites to avoid updating them frequently with spun content. I haven't done a press release in a while... not sure if that's the reason. Just trying to see if anyone else has experienced a drop with their wordpress blog or has a different strategy. Note: I'm going to try to blast another PR and see if it helps.