You can see what products are assigned to pages by downloading the pages data (Utilities > Database > Download > Pages) The assigned products will be in a field "Product Links" for each page.
Products not assigned to any page can be viewed by going to the Pages screen in the back office when in Basic Editing mode (There is a button at the bottom of the Pages screen which will be "Basic Editing" when you are in Advanced editing mode and "Advanced Editing" when in Basic Editing mode. ) So if you see the Advanced Editing button you should see a large white box with a list of all products not assigned to a page.
A utility to manage pages/products was released for public use a few weeks ago. You can find information about it in the posts
http://support.shopsite.com/forums/viewtopic.php?t=2641
Note that this utility was provided by Stone Edge but they have provided it as a free tool and do not provide support for it any longer. So you are on your own when it comes to using it . Please contact (nate-mws user in this forum) the person who said they will send it out to people who are interested in it.