Hi guys, now you can download latest release of WPF Docking Library from SourceForge.Net web site.
This is the link: http://sourceforge.net/projects/wpfdockinglib/
Just now I published there version 0.1.1 which correct some annoying bugs discovered in version 0.1. Nothing of new relevant features are added.
http://www.codeproject.com/WPF/WPFdockinglib.asp remains the reference link for features overview.