For alexa ranking, it might be easier if the site has a counter like what I have for this blog. But, if they do not, you might have trouble to find them. So, here is the add-on that you can use to detect the alexa ranking and page rank at the same time: download add on here. Don’t worry because it is free. This extension will only work with Firefox browser. If you are not using one, you can download it for free by using the link on the side bar (find the button ‘Get Firefox with Google toolbar’).