You get a little icon at the top right of the screen, and if you click on it whilst on any webpage you get this:
There is also a keyword research tool. At the moment it's in alpha stage so it just suggests keywords only, but the next version will plug directly into the Adwords Keyword tool and provide traffic, competition and CPC data. Sweet!
At the moment it looks like this:
It will also highlight no follow links on any page with a red dotted outline.
So, if you want to give it a whirl you can grab this extension here: https://chrome.google.com/extensions...aoclj?hl=en-US