Thank you all for your comments and your support, we can ensure you that we have a competent tech team working - but the attack we are suffering from is similar to what Yahoo experienced some time ago. As I posted yesterday, we are suffering from a quite sophisticated DDos attack.
Thank you namestrands for your hint about the Austrian company
www.block-ddos.com. We are in contact with them but they are currently unable to help us.
We are changing routings and moving to new IPs, and eventually this will help. Thank you for your patience, and let me assure you again that we will compensate you for the loss in revenue.