Our second Drupal 7 alpha version was released just over a month ago. Today, we’re proud to announce the release of the third alpha version of Drupal 7.x for your further testing and feedback. The first alpha announcement provided a comprehensive list of improvements made since Drupal 6.x, so in this announcement we’ll concentrate on how you can help ensure that Drupal 7 is released as soon as possible and is as rock solid as the previous Drupal releases that you’ve grown to love! The release notes contain a list of the biggest changes

Link:
Drupal 7.0 Alpha 3 released