According to recent news published on the website of the Hague Conference on Private International Law (HCCH), on Wednesday, 26 September 2007, Mexico deposited its instrument of accession to the Hague Convention of 30 June 2005 on Choice of Court Agreements. Pursuant to its Art. 31, one more ratification or accession will suffice to bring the Convention, which is open to all States, into force.
Further information on the Convention (status table, explanatory report and preliminary documents, translations and bibliography) can be found on the related section of the HCCH website.
(Many thanks to Pietro Franzina, University of Ferrara, for the tip-off)