I absolutely love the Danish language locale for Denmark, Narrative Cultural Specification page. Full of culture-parsing goodness like:
Denmark has its own cultural symbols in some cases and use of non-Danish symbols as icons can create irritation and — if they are not easily recognized — confusion. Example: The typical suburban American mailbox with the raised flag is unusual in Denmark and hence not immediately associated with mail for most users.
Every country should have a page like this. Oh, wait, they do. At least countries in Scandanavia do. Alas, it says here that “the registry has not been updated since December 2001.” Fortunately the Common Locale Data Repository seems to be taking its place.