I'm surprised no one else has asked about this yet, but Recaptcha has not worked on any of my websites in well over the last 36 hours, meaning no one can sign up to become a member. As far as I know, this started right around the same time as the emergency maintenance the other day.
When people sign up, they get an error: "Could Not Open Socket", which is originating from a PHP fsockopen() function within a library file (line 80) for: http://www.google.com/recaptcha
I submitted a support ticket over 24 hours ago. Let me know if there is a solution to this.