Mucking about in Drupal Again

I'm exciting about new potential project dealing with sf reviews online. The structure will be based on Drupal, an open source CMS driven site that uses PHP and MySQL. I looked into Drupal a little over a year ago, built a small site and test-drove the application. Nothing came out of that effort, but now I have some incentive to take another look. I download version 6.3 (it was 5.x when I last tried), installed it and now I need to a refresher on all the aspects of Drupal. Time to stretch the brain.