If you've been trying to reach this site, the reason to why it's been down is simple. The company that hosts my registered domain-names and direct the DNS-names, joker.com, has been under a DOS-attack:

Joker.com currently experiences massive distributed denial of service attacks against nameservers. This affects DNS resolution of Joker.com itself, and also domains which make use of Joker.com nameservers.

This means I'm not the only one affected, but hopefully, the disturbances are over.