http://drupal.org/ The main drupal site
http://groups.drupal.org/ Is part of the drupal.org group of sites. groups.drupal.org serves the Drupal community by providing a place for groups to organize
http://drupal.org/project/gmap Drupals gmap Module. The GMap module provides an interface to the Google Maps API within Drupal.
http://www.chicagoancestors.org/ an example of using Drupal.gmap
http://drupal.org/project/ubercart Ubercart Ubercart is an e-commerce suite developed for Drupal.
http://livetest.ubercart.org/uc1/ Ubercart 1.x livetest: showcasing droople Ubercart