I've just discovered a website that allows you to type your keywords and get an assessment of the value of these for Adsense, which then allows you to write your pages for keyword optimisation.

I realise there are a lot of keyword research tools out there, but this is the first time I've come across a website geared to AdSense publishers. I'm probably behind the times, but maybe the site will be useful to someone, or perhaps one of the AdSense gurus could make a comment on how accurate it is?

The site is spyfu.com