Very hard, You would need to register the domains with different details for example. the pattern of link networks is very hard to hide.

Having different c-class is not so importatnt, unless a high number of your links come from the same c-class. a c-class has 255 ip addresses, but each ip number can host a infinite number of websites, some small towns may have most of their web sites hosted on athe same ip number let alone c-class, so it is not un-common to have such links.

I would suggest you use the content for all these blogs on your own site, and try to attactt links. Haver a link network is dangerouse

Have a read of the links i posted, they are from google, both say there is no difference.

Why do you say google treats them differenct. what seomoz does is not the point

They definately do pass page rank, it is just if it is internal links or external.

They would nott have pr of 100, becauce each page has its own page rank.

also As i stated above, if google can tell if a sites is on the same subject or on multiple subjects.

Take a look at these 2 results, the first word press conatins a sub domain in its sitelinks, but to the en(english subdomain), they can tell that that subdomain belongs to the root.

https://www.google.com.au/#hl=en&output=search&sclient=psy-ab&q=wordpress&oq=wordpress&aq=f&aqi=g4&aql=&gs_l=hp.3..0l4.1292.1292.0.1676.1.1.0.0.0.0.383.383.3-1.1.0...0.0.eJcS0C6Duts&pbx=1&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.,cf.osb&fp=7c4df592a329114b&biw=1280&bih=909

Have look at this result and yopu will see that many of these companies subdomains are listed as belonging to the same site

https://www.google.com.au/#hl=en&sclient=psy-ab&q=iboats&oq=iboats&aq=f&aqi=&aql=&gs_l=hp.3...146410.147314.1.147555.6.6.0.0.0.0.0.0..0.0...0.0.MLsJj78G5H8&pbx=1&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.,cf.osb&fp=7c4df592a329114b&biw=1280&bih=909

Robots.txt, you can remove from google to hurry it up, using WMT, but first you need to block them in robots.txt

User-agent: *
Disallow:

User-agent: Google
Disallow: /bad

good answer josh.

i would like to add, for bing you should add miss spellings to the keyword tag. Yes Bing uses the keyword tag.