William Blake Archive

The William Blake Archive is a great and beautiful (and prize-winning) resource. It's stuffed with images - newly online are his 12 large colour prints, "often considered to be his greatest works as a pictorial artist"; there's a biography and additional resources including biographies, and an online version of the Complete poetry and prose of William Blake (ed by David Erdman). Oh, and searchable. (And you can choose between a US and a UK mirror site, which is why I haven't given any internal links.)