I am pleased to declare the Mill Marginalia blog open for business. Fuller descriptions of the Mill Marginalia Online project, its scope, goals, sources, and contributors, are available on the static pages of this site. This more dynamic space will be dedicated to providing updates and in-process explanations. The first of these will come from Carissa Schreiber, whose early work with Mill’s marginalia helped to establish the project’s metadata schema, to populate that schema with copious amounts of hyper-efficiently transcribed data, and to edit the initial set of photos of Mill’s handwritten marks and annotations into a coherently labeled and visually pleasing set of page images. We also anticipate upcoming messages from Anne Manuel, Somerville College librarian and a most felicitous institutional collaborator, as well as ongoing research and presentation reports from Albert Pionke and Emma Wilson.