The Early British Census project is now online at http://ebc.byu.edu. This is a work in progress that aims to become a searchable database of all the pre-1841 19th-century British censuses that are more than statistics (including Ireland), and eventually earlier censuses too.
With thanks to Liz Loveland (@lizl_genealogy) on Twitter for the above, which was subsequently featured in the Society of Genealogists’ June e-newsletter.