Yet a step closer to getting this module properly ported to Drupal 7.
Note about upgrading
In case you already tried/worked with CAPTCHA 7.x-1.0-alpha1: there is no upgrade path from 7.x-1.0-alpha1 and 7.x-1.0-alpha2. If you try to upgrade, you will get database errors. Instead, you should first uninstall the CAPTCHA module and reinstall 7.x-1.0-alpha2 (like a fresh install).