Different Websites Under Exactly Same IP
 

If someone has 5 totaly different(non duplicate) websites with unique URLS, all indexed, all pageranked but has the same IP for all of them and points links to a website of mine. One link from each site. Is this ok or not? Will google care?

I would say you might get a duplicate C class issue, meaning it is possible all of those five incomming links (resources is a nicer word) only count as one.

One question are all of the five sites you are liking from Highly relevant to the site you are linking to?

If not, it is ok.