I'd like to highlight a couple of websites focusing on equality, although at least one of them isn't new. The Equality Trust was created in 2008, after Richard Wilkinson and Kate Pickett secured a deal to publish the book "The Spirit Level: Why Equality Is Better For Everyone'>The Spirit Level: Why more equal societies almost always do better". The aim of the trust is to bring to the public knowledge about the 'social illnesses' caused by inequality and help develop the political will to tackle this issue.
The second one, called Demand Equity Now, was created by Policy Link, a very innovative and engaged think-thank / community organisation based in Oakland, California (a post-industrial city located near Berkeley). It is a platform to coordinate the efforts of advocates for a more equal world.
Both are very interesting for people who would like to be more active in this field, while being also a good source of information.