Workplace Safety and Health Transparency Act of 2006 - Amends the Occupational Health and Safety Act of 1970 and the Federal Mine Safety and Health Act of 1977 to prohibit the Secretary of Labor from promulgating or incorporating by reference, or approving occupational safety and health standards under a state plan that incorporates by reference, any finding, guideline, standard, limit, rule, or regulation based on a determination reached by any organization, unless the Secretary finds that such determination: (1) has been promulgated by a nationally recognized standards-producing organization under procedures whereby an opportunity was afforded for diverse views to be considered and whereby interested and affected persons substantial agreed on its adoption; and (2) in the case of a federal standard, has been designated as such a standard by the Secretary.