1851 census of England, Wales, the Isle of Man and Channel Islands at FamilySearch

FamilySearch have already added or updated 76 databases in November, many for the US and a lot for Italy. 

Courtesy of Findmypast there are now 18,341,933 records for the British Isles (minus Scotland and Ireland). These are searchable transcriptions of name, age,
gender, birthplace and relationship to head of household. There is a link to the record image at the commercial Findmypast site. Note that neither the place of residence nor the exact reference is given.

FamilySearch now has similar databases for each census available except 1871.