I see a lot of post about why Google this and why Google that.
Well Google has changed a few things a while back.
I think you will find the following links very useful in gaining a good PR rating with Google. There is no reason to guess anymore. It's all laid out it front of you. Some of the old things can get you banned also, so I suggest everyone read up on Google. Darrin Ward is a google expert, bar non.
http://www.darrinward.com/
http://www.google-dance.com/
http://www.seochat.com/
Hope this helps
Oz