The only census that are of any real use to researchers are those published from 1841 onwards. However there were a number of local census taken prior to 1841 most of these are of little use to the family historian. The latest census that is available is the 1901 at the moment. A book is available, "Local Census Listings, 1522-1930: Holdings in the British Isles" by Jeremy Gibson will guide you on where to find them and what they contain. The 1911 Census is due to be released in 2011. I have only transcribed information from the English Census so far.