University of Toronto (Canada)
University of Toronto: Selected Poetry of William Blake (1757 1827)
Full text of 40 annotated poems by William Blake.
Library of Congress
Loc: William Blake Digital Materials From the Lessing J. Rosenwald Collection
Handwritten letters, published art and poetry, and other artifacts are part of this digital exhibit.
Other
Dickenson College: Blake on Nature
This site from the Dickenson College provides a look at William Blake's philosohy on nature as evident in his writings. Provides links to other criticisms as well.