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Knowing pagerank can often tell you how popular your site is, and how google ranks your site. Pagerank is based out of 10, 0 being the worst, and 10 being the best. Pagerank is based on several factors, mainly inbound links.Normally, you would only be able to tell your pagerank using the google tool bar (or some other shady script), but now you can find out page rank without it :)
Note: You may get different results using a varying combination of http:// and www. If a site does not return a page rank, that means either the site is brand new, or has been banned from google.