Quote:
Originally Posted by Harmon
No longer important. Relative linking between different sites on the same IP hold water very well.
It really is about content. If it makes sense, and you do it right? IP means crap. It's about the end user experience. 
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Sure but my theory is that if you have two sites which have excellent unique content but both on the same subject matter and ranking well on the same keywords. If they share an IP, there is going to be a tendency for the search engine to want to drop one of those sites because they belong to the same entity.
The search engine may theorise that the entity is gaming the system or estimate that it is more likely to be the case.