Editing is one of the most important part of the film making. It is not only a technical process, but also a very creative one.
Wikipedia on Film Editing
Notes on Digital Film Editing by Gerhard Schumm
Art of Editing at Videouniversity (10 parts)
The History of Cutting – The Birth of Cinema and Continuity Editing
The History of Cutting – The Soviet Theory of Montage
Editing Aesthetics and Further Surfing
Best Film Editing Sequences
Art of the Guillotine – Blog/Podcast/Resources…
Thoughts on Editing and Observations on Film Art by K. Thompson and D. Bordwell
Hitchcock: 3 ideas about montage
The Science behind Film Editing
How Does an Editor Think and Feel?
Top 10 Most Effective Editing Moments of All Time
Useful Resource Links at Joyoffilmediting by Gael Chandler
Film Editing Podcast hosted by Patrick J. Don Vito