Click to Order The Complete Poetry and Prose of William Blake (soft $$).
This revised edition - endorsed by the Center for Scholarly Editions of the Modern Language Association - includes up-to-date work on variants (revisions), chronology of poems, and critical analysis by Harold Bloom.
Links of Interest:
Blake study examines how the poet's work is relevant to modern times, and includes links to e-texts.
Archive of Blake's poetry and engravings transferred into high-quality digital form.