Michael Erard posted this on LINGUIST

This article in the Washington Post(registration required) describes how Mexican Spanish is becoming 'standard' Spanish, through the power of Mexican television broadcasting giants Telemundo and Univision.

http://www.washingtonpost.com/wp-dyn/articles/A32693-2004Aug1.html

The article's title is Accent on Higher TV Ratings: Spanish-Language Network Telemundo Coaches Actors to Use Mexican Dialect It may be available via Google news in that format.

Michael Erard
LINGUIST List: Vol-15-2230