I've heard that if you have 2 or more domains, and they either point to eachotehr, or have exactly the same content, google etc will rank them lower.

Anyone know how I can get around this? I want a .com, and a .ie with differnt names. One is the company name and one is a kind of slogan for branding.

I was told that you can have the 2 different sites, change some text slightly and as long as google cannot tell they are idential, you can get away with it.