A scan of the Leigh Brackett script for ESB made the blog rounds, here's some of the coverage:
http://scriptshadow.blogspot.com/2010/03/alternative-draft-week-original-empire.html
http://www.mypdfscripts.com/screenplays/star-wars-episode-v-%E2%80%93-the-empire-strikes-back-leigh-brackett-draft
http://michaelbahr.blogspot.com/2010/04/star-wars-building-empire-part-1.html