I have a client that has one main ecommerce site and search engine ranking is very important.

They also have about 60 other domain names that are relevant to their main domain. example: pizzapie.com & cheesepizza.com.

The question I have is what would be the best way to utilize these domains without getting search engines mad (lose rank). Mirror? Forward? Or should I populate them with the same files? Or same files but change the text around as much as possible?

The last question is basically the same but they also have international domains with the same situation; pizzapie.jp, pizzapie.nz, etc. Would this be any different or does anyone have suggestions how to treat international domain names for ranking in US & the corresponding country?

Rule #1: DO NOT MIRROR, OR FORWARD TO, OTHER SITES. You never want to do this. EVER.

There's no way to do this without getting the engines angry.

Hello You can have the same content on all of them. But what i would suggest is have the same look on all of them but s far as possible have them with different content.

Regards