Blog Networks
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We have found a couple of blogs that would be good for some unique content but I suspect they may be part of a network. Apart from checking the IP and for duplicate content of them both, are there any other signs that they may be part of a network?
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most obvious thing is that they tend to link to one another heavily. use open site explorer to check the major links going through and see if one domain points to the others you are thinking about and then check the others.
also check their code and see if they are doing anything funny, like cloaking information - another common blog entwork trick
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If you use Reverse Internet: http://reverseinternet.com/, you will be able to see any shared Google adsense or affiliate IDs as well. If this is the case, it's probably a network.
If they haven't hidden the details, you could also try looking at the whois data with Domain Tools: http://www.domaintools.com/
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Cheers guys, much appreciated

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spyonweb.com will also look for the same Google Adsense and Google Analytics codes/accounts across sites.
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I tried Reverse Internet mentioned above. Do I need to be logged in. The site I'm checking on was posted live two weeks ago. Will it take some time to be read?
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Thanks Keri, how long does it to determine if this site is tied to a blog network. The SEO company working on it for a dentist I work with just posted it two weeks or so ago. mydentistapplevalley.com
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These sites don't diagnose if it's a blog network, they just show you sites that have common footprints.
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Thanks for clarifying, what are signs of common foot print. Ones that help me determine if that is what the SEO company is doing in order to guarantee high ranking. My client doesn't know anything about SEO tactics. Are there blog networks that are considered white hat or are they all black hat?
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This question is probably best to ask in its own question, rather than appending on to this one (as it's about a year old). If you can add some more context, that'd be really helpful. Thanks!