Swedish 18th century society. Great site with lots of information and photos. Also has a calendar with upcoming 18th century related events in Sweden, and a great links archive.
I’m not sure if this is the site for the entire society, or just for one of it’s events, but it has some nice photos in the gallery section.
Les menus plaisirs
Not exactly a society, but a performance company. Lots of great photos and a newsletter. Even some videos!