Some of you may not see any pagerank in the main page, just like me, still at PR3. But you may get some updates on your Internal Pages / Sub Pages. Because pages are link to the front page, you will usually get a lower pagerank, but from time to time, more and more sub pages will be getting PR.
SEOJunkie has created this simple little tool which will help you ease your job to find pagerank in your internal page.
Download Tool to Check Pagerank on Internal Pages