On the 2nd of July 2012 FamilySearch released index returns of the Scottish censuses for 1881 and 1891, meaning that they now provide records for 1841-1891. The data for this latest release has been provided by findmypast.co.uk.
Familysearch.org also hosts transcriptions and index returns for the censuses for England and Wales for the years 1841-1911. With their continuing work on the 1940 US Census, as well as their ever growing list of Canadian transcriptions, it is more evident than ever that this is an invaluable resource for any family history researcher. There really is a huge amount of information on offer, and best of all it's free!