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SEOMOZ says  Roger has detected a problem:  We have detected that the domain www.romancebookstore.com.au does not respond to web requests. Using this domain, we will be unable to crawl your site or present accurate SERP information .  What is wrong with this domain??

Hi
My Google PR rank is still 1/10 (www.abouttownmarketing.com) after 12 weeks of daily SEO work building what I thought were quality back links.  Does anyone know how often Google updates its PR rank?  Also is it a linear measure or link adwords quality score is it exponential?
Many thanks
Damien