BBC - The Office: The official site, featuring highlights, episode and character guide, maps, wallpaper, interviews and gallery.
BBC America: The Office: Includes episode guide, character profiles, video clips, discussion board and pictures from the Emmys.
CultureVulture.net - The Office: Reviews of the first and second series.
Dooyoo - The Office: User comments and reviews.
IMDb - The Office: Synopsis, cast and crew information, plus user comments, a message board and links.
MediaGuardian: I want to see you in my office again: Special report on the history of how the series came to be made. [Requires registration]
Off The Telly - The Office 2002: Review of the second series, by Chris Diamond.
Off The Telly - The Office Christmas Specials: Review by Ian Sparham.
Skinzville: Images and character profiles.
Stapler in a Jelly: Fan tribute offering character and episode guides, images and selected quotations.
The Brent-Meister-General Soundboard: Offers a selection of audio clips from the show.
The World of The Office: Fan site including a plot synopsis, an episode guide, trivia, interviews, character profiles, pictures, multimedia clips, links and games.
Wikipedia: The Office (UK TV series): Article offering a plot summary, details of the principal characters, an episode guide, links, and a comparison of the UK and US versions.
Yahoo! Groups - Officegossip: Discussion board, including information and pictures.