This going to cause a little grief for my students.
http://www.iupac.org/web/nt/2010-12-13_2009-atomic-weights
Full technical report here
http://iupac.org/publications/pac/asap/PAC-REP-10-09-14/
Been a busy year for the IUPAC people, they are about to redefine hydrogen bonding as well.
Mark