There are several different flavors:
The original KDE web sites:
The most important one is www.kde.org, of course, the virtual center of all information on KDE
Grouped around this center is the "family" of specialized web servers like developer.kde.org (info and documentation for programmers), l10n.kde.org (well, you know), lists.kde.org (searchable archives of most KDE mailing lists), bugs.kde.org (web interface for the bug reporting and tracking system), devel-home.kde.org (home pages for several KDE apps), koffice.org (for the KDE office suite), www.kdevelop.org (home of the KDE programming environment), and kde.themes.org (info and showroom for KDE designs).
Localized and translated KDE web sites:
Those for internal use of the translation teams (with to-do lists, translation term lists, Howtos, style guides and so on) such as l10n.kde.org/teams/fr/. Remember: you can get such a site on the i18n server for your translation team
And user sites such as the ones at www.kde.org/international/ which are mostly translations of www.kde.org and its "family".