Raphael Speyer, who worked on EcmaScript 5 support in Rhino, has completed his Google Summer of Code term. Thanks to Raphael for his work--he met his original schedule (we all know how hard that is) and implemented most of the ES5 spec in Rhino. I'll take care of the remaining ES5 work, which includes reviewing and committing the remaining patches and implementing strict mode. You can watch the progress via this tracking bug if you're so inclined. Thanks also to Google for their support of the Google Summer of Code program.