I have stored version 0.6.3 of the architecture document on Grid Forge.  This version reflects all changes made since the 0.6.2 version, primarily those resulting from the August, 2006 F2F in Edinburgh.  Note that this should be considered an interim version since not all of the work flowing from the August F2F has been completed.

Here is the link to the document:
        http://forge.gridforum.org/sf/go/doc14053?nav=1

Allen