Some general queries regarding Google PR and Alexa PR:

1.Which is the most important PR-Google or Alexa?
2.Are the PR's based on traffic or backlinks?
3.How often do these PR's get updated?

The forum http://forums.seochat.com/google-page-rank-47/google-pr-vs-alexa-rank-23... discusses the above questions.Also ,note the comment posted on this forum by Coolrider on January 25th, 2009.