If you fancy a PR 7 site here’s three simple steps to achieve a PR 7 site.
1) Make some popular wordpress plugins such as these
2) Make your plugin link back to your site using a hidden link so the person who installs the plugin doesn’t know about the link.
3) Sit and watch the PR come in http://www.sterling-adventures.co.uk/blog/ and then sell links to argos and confussed.com
Big respect the guy / gal who did this!