Sorry for dropping by late!
The website downtime was not intentional, but a problem with my web server. In fact, I have no plans to take it offline anytime soon, that is until somebody is willing to take over. The domain "jsfml.org" will expire in November, but a permanent redirect is established right now and I feel it's early enough.
Here's a backup of the website anyway, somebody keep it safe:
http://stuff.pdinklag.de/jsfml-web.tgz