Auf Wiedersehen 30 March 2004 has now moved from One & One to Black Cat :]

I'll leave it a few hours for DNS to sort itself out then everything should be back to normal.

If you ever need to register/move a domain then you should speak to Black Cat - they have a team of highly trained ninja sysadmins on hand 25 hours a day and will sort everything out for you in no time at all ;]