Canadians still have it easier than Mexicans when applying for a work-based NAFTA/TN visa to the United States: They can proceed straight to a U.S. border, documents in hand, and request entry, while Mexicans must go to a U.S. consulate for a visa stamp before proceeding to the U.S. border or entry point.
But that's progress: At least one step has been taken out of the process for Mexican applicants who, until February 10, 2014, had to submit a Form I-129 to U.S. Citizenship and Immigration Services before going to the U.S. consulate. For details, see the final rule announced by the State Department in the Federal Register.
To learn more about the eligibility and application requirements fot the TN visa, see "TN Visa to the U.S. From Mexico or Canada: Who Qualifies?" and "TN Visa Application Procedures for Mexicans." Also see the TN and TD Visa articles on usimmigrationlawyers.com.