Jeff Twitchell-Waas sends the following note, which is indeed worth passing on:
Z-site: A Companion to the Works of Louis Zukofsky is a scholarly website, which at the moment primarily consists of a fairly comprehensive set of annotations to "A", more perfunctory notes on the Short Poems, plus various bibliographies and notes. Interested Zukofsky readers are encouraged to send back augmentations, corrections and feedback.