currently i have 5 websites pr: 0 pr: 0 pr: 3 pr: 5 pr: 5 they are all located on different servers, with different ips, registered with different info, and even in different countries. is this enough to a do some kind of exchange, to give some of that nice pr5 power to the pr: 0s or pr: 3? I'm thinking of some kind of link circle, i dont know
Yes, it sure is. Even if they were all on same server and same whois info, the PR would get passed. But since they are on differnet ip's and different whois info, the links should carry more google juice beyond just PR.
Yeah sure they will pass some PR, but remember the relevance, no use exchanging links if they are not relevant IMHO.