I've configured a Amazon Webservices Load Balancer for my site.
It's all good the domain name resolves to the IP address of the Load Balancer Endpoint, and on the internal LAN it communicates with my two front end webservers.
I've noticed in webmaster tools that Google has picked up the IP of the load balancer and is serving the site up on the IP address as well as when the host name is used.
E.g. 54.76.x.x
If it were IIS I could use the host-header setting to block it serving up on the IP as well but there appears to be no control over this in the AWS admin panel?