We are working at a free Google SEO chrome plugin.
The plugin is actually a SEO Toolbar for Google Chrome.
You will be able to check Page Rank, Alexa Rank, Yahoo Domain Links, Dmoz directory and so on.
I know that out there are some Page Rank / Alexa Rank Chrome plugins but they doesn’t work smoothly like ours.
Stay tuned for the launch of a SEO extension for Chrome.
Please let a comment telling what features you would like our SEO extension to have.