This add-on let you set values of some html head tags content. This is important when your website has few pages and / or few text content. In that case every words are importants and SEO guys whant to be able to change it.
How to use it
Install this add-on as usual: http://plone.org/documentation/kb/installing-add-ons-quick-how-to
Next you have a new tabs 'SEO' in your edit bar. Click on it will give you a simple form where you can change the following head tags values:
How it works
This add-on is a very small one. It has less than 200 lines of code. SEO fields are stored in annotation, the form use plone.autoform and it override Plone related viewlets plone.htmlhead.title and plone.htmlhead.dublincore to achieve the needs.