On my WP blog, I intend to publish a small state-by-state niche directory of service providers. Each state will be a post linked to by a "page" with a map. Anyway, my question: Is it better to publish all 50 posts in a single day or will this be viewed as "spam" by the search engines? Is there an "optimal" way to publish a large quantity of similar (but different) posts - 2/day, 5/day? I don't want to take forever to get it completely up either. The content isn't spam and will be helpful to visitors. I'd just like to do it in a manner that gets the biggest SEO benefit. Thanks