Yale Modernism Lab
http://modernism.research.yale.edu/
Of course we’re biased, but this is certainly one of the best resources for data on modern British novelists, for short interpretive essays, and for digital archives of novels, poems, and essays.

The Modernist Novel—David Trotter
http://cco.cambridge.org/extract?id=ccol0521495164_CCOL0521495164A005
This chapter from The Cambridge Companion to Modernism is available through Yale Library’s web resources. It serves as a good introduction to many of the formal, historical, and philosophical concerns of modern novelists such as Ford Madox Ford, Joseph Conrad, and Wyndham Lewis.

Modern (British and American)
http://vos.ucsb.edu/browse.asp?id=2747#id592
Professor Alan Liu’s Voice of the Shuttle project has a useful collection of links relating to many, many modernist figures. A large number of the included links are dead, but the site is still the most complete dumping ground for modernism links around.

Picturing Literary Modernism
http://beinecke.library.yale.edu/digitallibrary/modernism.html
Beinecke has a wonderful site devoted to the role of photography in literary modernism. It includes digitized photographs from the archives of, among others, Ezra Pound, William Carlos Williams, and Langston Hughes.