Ideas For Moving To A New Domain Name?

Trying to come up with a way to move to a new domain name.

[problemassassin]

I am trying to rename our web site and I just want domainA and domainB to be exactly the same and want Google to consider them the same site because they are the same site. Does anyone know how to do that?

Ok, if that isn't possible and assuming I will be severely penalized for doing this aliasing, then I wonder if I could just have domainB be exactly the same as domainA except domainB has a little noindex or nocrawl tag so Google doesn't crawl it. But I still get full use out of my new name! Would this work?

I just want to change names and not be killed for it!