I uploaded a patch to the Spambot module that updates it to Drupal 7.
Most of the changes were required to meet the new DB schema syntax requirements, but a big one was a re-factor of the function name from user_delete to user_cancel...
Yeah, that'll slow you down if you're trying to remove those automated spam accounts! So, once I modified the code, I created a 'diff' file that automates the process of changing the old module into the new one.