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Originally Posted by baddog
Have you ever heard of the host crowding penalty? You think that is an urban legend or something?
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Sure, i've heard about it, and its not a urban legend, but it certainly is not what you are implying it is. Host Crowding has little or nothing to do with IP's, allthough you can be sure its "checked against your inbounds and outbounds"? IP check may be a direct relative of host crowding but its not why host crowding was implemented, and not its job to be in charge of looking after.
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Originally Posted by MattCutts
For several years Google has used something called ?host crowding,? which means that Google will show up to two results from each hostname/subdomain of a domain name. That approach works very well to show 1-2 results from a subdomain, but we did hear complaints that for some types of searches (e.g. esoteric or long-tail searches), Google could return a search page with lots of results all from one domain. In the last few weeks we changed our algorithms to make that less likely to happen in the future.
This change doesn?t apply across the board; if a particular domain is really relevant, we may still return several results from that domain. For example, with a search query like [ibm] the user probably likes/wants to see several results from ibm.com. Note that this is a pretty subtle change, and it doesn?t affect a majority of our queries. In fact, this change has been live for a couple weeks or so now and no one noticed.
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Source:
http://www.mattcutts.com/blog/subdom...ubdirectories/
Now again i will say, there is far more important things to worry about. Using new IP's and new Nameservers is not done as a offensive or strategical move, it is purely functionable as a defense, for showing the links are from "external sources".
Now i can agree that you will not take a more then 2 spaces in a serp with the same IP, but i have to ask, who in their right fucking mind would attempt to rank more then 2 domains for the same serp and host them all on the same IP, i guess only a fool.