The Whoniverse is a guide to the universe of Doctor Who, both on TV and in other media. If you want to know precisely which parts of the extended Doctor Who mythos we cover on the site, then The Whoniverse Guide to "Canon" will tell you all you want to know.
The Discontinuity Guide - Tongue in cheek reviews and continuity guides to televised, prose, and comic strip stories.
The Newbies Guide - Everything a newcomer needs to know to understand any given story.
TARDIS Technical Index - A complete guide to the TARDIS, the Doctor's famous time machine.
We also have a few Articles exploring major continuity issues.
The Doctor's Biography - The full life story of the Doctor himself. Includes a condensed timeline-only version.
A History of the Whoniverse - an extensive guide to every event from the beginning of the universe till its end
The UNIT Files - a conspiracy theorist's guide to the United Nations Intelligence Taskforce, and the Doctor agents who have been associated with it.