When you can not think of a new page to add to your site/blog have you ever considered using a question that people search for looking an answer ? It can help you gain visitors, and help with thinking of content to write about. Since many people search for answers to questions, having that question as your page, or blog post, title can help your page showing higher in serps. If you have not tried it before, have a look at the wordtracker.com question finder for ideas. http://labs.wordtracker.com/keyword-questions/
Using a forum and the title of the threads first post is a great way to get high rankings.. It work even better if you have a rating sytem so the best answers can be higher rated. Would work even better if the highest rated answer would be moved automatically as the first answer.