Mac OS X only: You've already heard about the new features and upgrades the latest iteration of Apple's office suite iWork '09 is getting—and now you can give them a test drive. Download the 30-day trial of iWork '09 before you commit to the $79 investment. What are your favorite apps in iWork? What do you use 'em most for? Post up your devotion to Numbers or Keynote in the comments.