This is an old post that I found in the depth of my documents, while the test is old I certainly think the point of the article remains
Ages ago Aaron Wall made a short post promoting a friends online web tool. In the post Aaron suggested, given Page Rank’s infrequent updates and old data that the date Google last cached your site was a better indication of how much Google “trusted” your site than the green strip in the Google Toolbar.
It got me thinking, quarterly updates of Page Rank with data from who knows when, while quite useful isn’t the most reliable indication of how respected you are in the halls of the Googleplex. With the rise of blogs, RSS, social media & user generated content how long ago the search engine spiders visited your site probably is pretty good indication of how important your site is.