Nice article, but there is an issue with Windows 2008 and xp_logininfo.
Since my domain is all Windows 2008, the column logininfo_note is always either NULL or xp_logininfo returned error 15404.
The error is documented here;
http://matticus-au.blogspot.com/2009/08/windows-2008-and-xplogininfo.html
The workaround is pretty straight forward, but I personally have not tested it.