Will had quoted an article from SEOmoz SEOmoz | New & Interesting Insights Into Google Rankings & Spam from Pubcon in a separate thread (http://www.netbuilders.org/promoting...tml#post102222). So I went to read that article and part of it really worries me.

Here is a quote from the article:

Having Multiple Sites Targeting Subsections of the Same Niche can be Indicative of Spam
Matt Cutts today mentioned that "having multiple sites for different areas of the same industry can be a red flag to Google." Though Googlers have mentioned this before, today's site review panel brought renewed attention to both Google's ability and proclivity for carefully considering not only an individual site, but all the other sites owned by that registrant/entity/person. Given Google's tremendous amount of data on web usage behavior, many SEOs suspect that they track beyond simply domain registration records
I operate 3 or 4 sites in the same niche, in several niches, so the idea of Google considering this as spam is quite worrying.

What do you guys think the implications of this are?