The major construction of the "skyway" portion (fixed bridge portion) is done as of the end of 2007. The only remaining part is the suspension section which will hang from a 525 fott tall tower. That part won't be done until 2012. This article has liots of interesting descriptions of the construction: http://www.insidebayarea.com/ci_7848808
http://www.insidebayarea.com/ci_7848808