I have a lot of websites which give a overview of certain topic. For example games, lyrics, ... These websites have thousands of pages. Yesterday i optimized all the pages to .html instead of php extensions and without vars.
Now when i put an inbound link on every page ( some pages wil become PR2 and PR3 because they will be shown randomly and get some pr of index and also the latest are mentioned ) does this have a big effect on the results in google ?