My application to join the International Association of Mathematical Physics (IAMP) was successful. I received a letter via email on the 20th July 2012 stating this. I am now an ordinary member of the IAMP.
The International Association of Mathematical Physics (IAMP) was founded in 1976 in order to promote research in mathematical physics. The Association invites mathematicians and physicists (including students) interested in this goal to become members.
The International Congress of Mathematical Physics (ICMP) is organised by the IAMP, the next congress is in Aalborg, 6-11 August 2012.
Follow this link for more information about joining.