I've recently added the ability for potential members to register and/or sign-in on the site with their Facebook, Twitter, and Steam accounts. Once they use these to sign in, their own ES account will be created and linked with whatever account they used to register. I'm hoping this will expand our user base and make it easier for a wide variety of different people to become involved with the site.
Oh, and if you already have an account and are interested in linking it with any of the above applications, you may do so adjusting your profile settings.