Languages and Locales mailing list.
List discussing all aspects of locales standardization. Light traffic.
http://groups.yahoo.com/group/locales

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