Alan Moore's Watchmen - Contents of and annotations to the 12 chapters of Watchmen.
Dennette's Watchmen Page
Secret Identities: Unmasking the Creators of Watchmen
The Annotated Watchmen - Reading companion to Alan Moore's political classic. Focuses on giving insight to the series, using internal and external references.
Watching the Detectives - In-depth annotations, discussion, and images, submissions accepted.
Watchmen Annotations - The collected annotations to the Watchmen series, published by DC comics, as compiled by Doug Atkinson.
Watchmen Screenplay - by Sam Hamm.