From the site:
Involve your audiences in discussing your strategies, draft reports or consultation papers.
‘Commentable’ online documents are a great way to establish two-way dialogue with the people who care about your organisation. But until now, you’ve had to build them yourself, often from scratch, either hosting your own or working around the limitations of your content management system or free tools.
Read+Comment is purpose-built on modern, open source WordPress technology with all the configuration and plugins set up for you. Sign up, put your content in, and make the site your own.
From the about page:
Read+Comment is a WordPress 3.0 multisite installation, running a single theme – Commentariat2. Commentariat2 was designed specifically to be a flexible tool for building document-centric sites, enabling easy comments and rapid customisation of the look and feel.