This is the official drupal.org website
Here you can find support, downloads (Drupal release, Themes, Modules) and handbooks for end-users / developers.
A larger community for Drupal users. Here you will find groups of people working together on related tasks. Some popular groups include mapping, user group organizers, podcasting, media, documentation team, etc.
Chicago Drupal Group
You can reach the CDMUG drupal group http://groups.drupal.org/chicago.
Our meetup.com presence. This is the location to RSVP for our events.