University of Michigan
U of Michigan: Arthur Miller Files
This conviently arranged site offers a timeline, a list of works, with summaries and analysis, biographical information, interviews, etc. Also offers a list of resources, both print and electronic.
Other
Curtain Up: An Overview of Arthur Miller's Career
Probably the most useful aspect of the site is the section on trademark features of Miller's plays. Also includes a chronology of his work, some biographical details and links to reviews of his plays.
Swiss Educ
Swiss Educ: Miller, Arthur, 1915 2005
Rich and varied resources dealing with the author's life, his politics and his work. Video, still images, audio files and essays by him and about him are all available.