Steve ... there are just lots of pages on that site. Also US Consulates are famous for having outdated info on their web sites. For instance, the business and retirement applications below are identical and I've never seen that one in Mexico. Immigration offices still differ greatly in their procedures - some make it easy and others prefer you to jump thru many hoops.

Nonimmigrant Visa (FM3) for business

Nonimmigrant Visa (FM3) for retirees