The guy who give me the most straight answers was a guy that working in a big travel site of greece...over 10 years old and IMO knows what he is saying.Again their cooperation is only for the adwords campaighn but i guess this will be the closest to G that we can ever reach...
How about u hear it from the google guys itself? How about u read matt cutts blog? Remember, no one gets insider information about company's top secret algorithm. I am confident that google's algo is only known to a bunch of people in higher circles. People claiming that they know how PR is calculated are total BS. Its all theory and not a fact. anyways a guy in this industry for 10 yrs, can surely give u some good advice. So get the advice and move on. Dont be totally surprised if the advice didnt turn out to be the fact.
yes only very few people know exactly how G is working but many people know by experience and can prove some factors on G algo.For example even thought i have little experience(less than a year) i know that the domain age is a big factor for G and i can prove it.So you learn something from everyone he can prove it and you know a little bit of G algo.