Norfolk researchers also have a single search interface from Cultural Services at Norfolk County Council, the Norfolk Online Access to Heritage. Specify a search and it queries a variety of sources from the Library Service, The Norfolk Record Office and Norfolk Museums and Archaeology Service returning a list of hits found in the various collections. They include catalogue entries, maps, aerial photographs, probate listings and, directory images. A complete list of data sources is at http://www.noah.norfolk.gov.uk/databases.aspx
A database I found particularly useful includes original images of wills proved and letters of administration granted in the period 1800-1858 in the courts of the Bishop of Norwich (the Consistory Court), the Archdeacons of Norfolk and Norwich and the Dean and Chapter of Norwich.