In my previous releases (which are based upon NewIT-Debian Squeeze Release) the hostname is easily configureable via hostname command, but the DNS-Name always remains "dreamplug".
To alter the DNS-Name, you have to edit dhclient.conf:
At the top of the document there's the line where you have to apply changes:
send host-name "dreamplug";
change here to whatever your DNS-Name should be and restart networking.
Done - pretty easy when you know where to look for it ;)