It's been a month figuring out how to appear my PR-Page Rank on my site and it always shows " N/A" as the result when i use the google PR checker. Finally i stumble on this cool plugin on wordpress called Google XML Sitemaps just installed it, activate it and create and XML sitemap for you site. Automatically when you check your PR it will appear instead of "N/A".
Google XML Sitemaps will generate a sitemaps.org compatible sitemap of your WordPress blog which is supported by Ask.com, Google, MSN Search and YAHOO. Unlike “Dagon Design Sitemap Generator” above, this plugin wil generate a xml file which can be submitted to search engine directly. There’s even function in the plugin itself to update the sitemap and ping Yahoo and Google everytime you write and publsh a new post. You can see it live on my XML sitemap here.