Kai,
Looking at the whois records for braukaiser.com I see that your name is still the registered contact, and the TTL (the time the DNS server takes between checking for updates) is just under 24 hours, obviously that time hasn't passed yet so it's possible someone else took over the domain. For what it's worth you should be able to re-register the domain once that 24 hour period has passed. I'll keep an eye on it today and if I see it switch over to 'available' I'll ping you via DM.
I see the DNS host as being: RENEWYOURNAME.NET, which points to Tucows, and Tucows says your registered provider is
http://www.registergo.com - have you tried logging in with them or contacting them?
Note that the actual content showing right now for your site is the default placeholder content for pretty much any DNS provider. They figure, why have a blank page show up when we can make money off ads, so I wouldn't immediately assume that someone else has taken over your page.