Concern of high DNS traffic load with Vista and IPv6

CNet reported that Paul Mockapetris, the inventor of DNS believes that Windows Vista will cause some DNS servers to overload because Vista will perform an IPv6 lookup first, followed by an IPv4 lookup.  CNet also reported that Vista will be the first windows OS to include IPv6, which is only partially correct, Vista is the first windows OS to have IPv6 initially activated. 

The IPv6 stack has been included in every version of Windows XP Home Edition and Professional since October 2001, it just hasn't been installed.  To install the IPv6 stack you have to bring up the command prompt and type "IPv6 install".

I haven't installed the stack personally, primarily since what I access is still IPv4.  I am intrigued that IPv6 is supposed to eliminate the need for NAT but I have concerns on how the new stack will interact with my existing do-all broadband hardware router/firewall/DCHP/NAT box, so I'll need to test the setup on a spare system to see how it fits with my current home network.  Oh eventually, I'll be forced to jump on the hardware/software upgrade carousel again, but for now, good ol' IPv4 will do just fine.