Almost every blogger and site owner is obsessed about their Google PageRank. The problem is, no-one can say for certain exactly how it works and Google are fairly quiet on the subject, so that the algorithm doesn’t get abused. It would probably be the biggest online joke ever if Google PageRank’s played no real role in Google’s algorithms!
Anyway, if you do believe in Google PageRank’s then this post from Smashing Magazine is the only one you need to read. It’s one of the most comprehensive posts I have ever seen and an amazing amount of effort has been put into researching how Google PageRanks work, and what factors do and don’t have an impact.