I have my ticket for May 25th because I don't like the long lines of the first weekend. It opens on May 19th everywhere.
Cannes Film Festival 5/15/05, London premiere 5/16/05, Kuwait 5/17/05, 5 more countries listed on th 18th {including France}, the majority of the rest of the world on the 19th , 8 countries on the 20th, Taiwan on the 21st and Japan on July 9th.