Introduction to Software Translation for MFC
Robert Pittenger provides provides some guidelines to make software localization it as easy as possible. This article was published in May 2000.
http://www.codeproject.com/cpp/introtolocalization.asp

Standard Library Locales
50 pages guide on using C++ Locales. The guide notably includes: a brief overview on internationalization and localization, the differences between C and C++ locales, details on the creation of Facet objects (the main aspect of C++ Locales), etc. This Guide requires Acrobat Reader.
http://www.tru64unix.compaq.com/cplus/intzln.pdf