The vienna secession
These days I stumbled upon a rather young site about The Vienna Secession.
My brothers and sisters in beauty, I can advise you to take a look here:http://www.theviennasecession.com
But be sure that you have a couple of hours, because there are tons of content.
It is a fine site, the only remark I can make is that some of the mentioned artists, like Mucha or Vogeler hadn't anything at all, to do with the Viennese Secession. But who bothers....