I have been working on a way for users to register using their accounts at Facebook, Google, OpenID, Yahoo, AOL, MSN etc... in RavenNuke. This project is coming along nicely. With this mod, users are automatically registered and logged in with only having to enter their password twice while not affecting the regular registration settings. You can test a working demo at http://rn.trickedoutnews.com by clicking the "Use 3rd Party Account" link.  The test site may be down from time to time as I am working on several things including the Tricked Out Bar which you can see on both sites.