In the latest, Google Webmaster Help Video by Matt Cutts he answers the question:
Does a website get a better overall ranking if it has a large amount of indexed pages?
Leah, New York
This question is great when it comes to small business websites vs big brands or news and media sites because most small businesses don’t have a reason for lots of pages but can use their blog to create content and get more posts indexed.
Bottomline, if you create a page make it a dedicated landing page that targets unique content and keywords that isn’t on any other pages of your site. The idea behind this is Matt Cutts mentioned the only reason to have more pages is for more “opportunity” to rank for new or other keywords that you haven’t targeted with any other pages. Lastly, he mentions it’s still about getting links pointed to the pages of your website.