Hey guys, I have a couple of PR3 sites and want to improve PR (and traffic, too). I am planning to add a link directory on each site (most likely it will be installed on a subdomain, e.g. dir.domain.com). This will help me to get many link partners, but the question is, if Google 'likes' my sites after that? (now it does.) I really don't want to get a '-200' filter or smth like that
Yes , It is better,normally sub domain take as separate domain. And it is increase your internal page structure. But i'm not sure about PR. but you can improve back links.