Two masters for failover web server?

[Erik Wheeler]

Hi all:

I'm looking to set up a failover web server, and I'm wondering about doing 
the following.

Host1 would be the main web server, and Host2 would be a mirror of Host1.
Host1 would also be the primary nameserver, and Host2 would have the same 
zone file as Host1, and be configured as a master server.

So if Host1 goes down, the secondary nameserver will take over, and point 
web requests to itself.

Is this kosher? Or am I going to pollute the nameservers of the world and 
crash the internet, thereby ending life as we know it? I searched for info 
on a setup such as this, but didn't find much.

Thanks,

Erik