The most recent Google page rank (PR) update has been completed on 04th February 2013. As you aware the page rank is determined by the quality of the page content and number of back links to the site. This has been updated once in every quarter.
I was eagerly waiting for the PR update and I am happy this time. My Blog(www.acehints.com) got a nonzero value as page rank. You can check the pagerank here http://www.prchecker.info/check_page_rank.php