There are a lot of talks about "Please add book pages when you solved some problems!". My suggestion is to make user profile that way so it would reflect book pages added by the user. I think that at the main user page such as "site/user/13" could reflect number of book pages added , and a link to the listing of all pages added (or, maybe a tab in user profile).
Example: "ultraBoy has contributed 5 pages to handbooks."
When you look at 4.6 contribution the release date on the file download link does not match the actual release. This is very confusing and there seem to be more and more of these turning up on the downloads page.