I'm just about to start a new business which creates niche affiliate sites. I'm curious about the impacts to me from Google of all the urls being hosted with the same analytic tags, webmaster tool tags and server ip ranges.

To benefit the most from google's serps should i have each domain within seperate analytic accounts and webmaster tools or is it ok for me to have all of my domains within one account.

My issue is duplicate content and the fact that i am building a publisher network and i'm not sure how much google likes them.

I'm notoriously bad at searching and as such havent found what i'm looking for yet. Any help would be very much appreciated.