Marcia - 3:20 am on Jul 27, 2008 (gmt 0)

>>With regard to testing, I haven't done fully controlled experiments, but I do have two anecdotes.

Speaking of anecdotal evidence, how about when there's consistent evidence over a period of time that with related sites linked to, hosted on the same c-block, only a couple of them will have PR transmitted to them, with PR0 to the others?

Is Yahoo! the only engine that takes a hard look at nepotistic linking, or is it possible that Google does also?

Adversarial Information Retrieval on the Web [sigir.org](PDF file)

How about nepotistic linking and cross-linking in boilerplate portions of web pages - like sidebars or footers? Is it worth taking a look at that?