b.f.i (British Film Institute) www.bfi.org.uk
Facts on film. Books and videos.

box office www.worldwideboxoffice.com
Film ratings, box office returns (in dollars).

box office guru (Worldwide) www.boxofficeguru.com
Mainstream, worldwide box office.

box office mojo (U.S.) www.boxofficemojo.com
Mainstream, hollywood box office and discussion forums.

filmmaker magazine www.filmmakermagazine.com
The magazine of independent film.

filmmaking advice www.shohawk.com
Your movie is our work.

hollywood reporter www.hollywoodreporter.com
Mainstream movie studio news.

i.a.c (Institute of Amateur Cinematographers) www.fvi.org.uk
The world of non-commercial film and A-V.
 

the gotham (formerly Independent Filmmaker Project) thegotham.org
We are a community of creators.

indie talk www.indietalk.com
A Filmmaking Community.

indiewire www.indiewire.com
Movie, TV and celebrity news and reviews.

imdb (Internet Movie Database) www.imdb.com
Huge reference and cross referenced resource covering films, actors, directors etc. Mainstream.

movie maker www.moviemaker.com
Moviemaker magazine.

shooting people www.shootingpeople.org
The International networking organisation dedicated to the support and promotion of independent film making.

variety www.variety.com
Mostly mainstream film studio news.

women make movies www.wmm.com
Films by and about women.
 

See Links for pre-post and production; Events for International festivals and competitions.

IMPORTANT: A websites Inclusion here is not an endorsement of the site, or its current availability.