From the commit log:
Author: ton Date: 2011-04-12 16:24:24 +0000 (Tue, 12 Apr 2011) Log Message: ----------- The Epic Blender 2.57 first stable commit! :) Let's do a quick last check if things work, call for release will be done shortly on bf-committers. Thanks everyone for making it possible!
Builds are already available on graphicall.