Manuals, books and documentation often require a structured hierarchy of chapters and sub-chapters, contrary to blogs, which are typically organized by date.
Each manual can have its own assigned contributors. Each page can have its own attachments (images, videos, downloads) as well as a feedback/comment feed if needed.
Manuals can be navigated hierarchically or searched in full-text. You can also easily create transverse hyperlinks from one page to another using easy Wiki-like markup.