Glock Talk - Features chat rooms for various aspects and models of the Glock pistol. - http://www.glocktalk.com/
The Official Glock Sports Shooting Foundation - Provides online reference materials, schedules and maps, as well as searchable GSSF match results for current and past years. - http://www.gssfonline.com/
The Glock FAQ - Offers a range of information about the Glock pistol in all of its configurations. Also provides a newsletter. - http://www.glockfaq.com/