I started this blog to list production companies and agents open to accepting script queries and screenplay submissions, with an emphasis on those who already have a proven track record and are open to online queries (coming from Australia, postage costs add up!) Everything here is free. Great resources for screenwriters include the Done Deal Pro message board, Zoetrope and Triggerstreet.
Neo Art & Logic has worked on many films including American Yakuza (Viggo Mortensen, Russell Crowe), Children of the Corn 7: Revelation, Dracula 2000 (Gerard Butler, Omar Epps), The Prophecy (Christian Walker, Virginia Madsen), Seed of Chucky, many of the Hellraiser movies, Feast (from the original US version of Project Greenlight), He Was a Quiet Man (Christian Slater) and Pulse (Kristen Bell) They are open to online story ideas/pitches on their Submissions page.
Lee Daniels Entertainment produced Monster's Ball (Halle Berry, Billy Bob Thornton, Heath Ledger), The Woodsman (Kevin Bacon, Kyra Sedgwick) and Shadowboxer (Helen Mirren, Cuba Gooding, Jnr). They are open to online pitches here.
Circle of Confusion is a production and management company with a huge reputation. They have been involved with the production of Underworld 3, Quarantine, Jumper, Letters From Iwo Jima, Mr & Mrs Smith, Fantastic Four, Magic Kingdom For Sale, Spirit: Stallion of the Cimmaron, V for Vendetta, The Matrix... 'nuff said? They like genre stuff. They accept queries here.
Benderspink is a management and production company responsible for the American Pie series, The Ring, The Butterfly Effect, Red Eye and A History of Violence. They are open to screenplay queries on their website.
South Pacific Pictures is a New Zealand based production company. They made the critically-acclaimed Whale Rider and Sione's Wedding. They produce a lot of stuff for NZ television including Shortland Street and Outrageous Fortune. Submissions are in hard copy, but they have a detailed Pitching Ideas page.