Quoting from the FamilySearch Labs Website, "The England Jurisdictions 1851 project simplifies research by consolidating data from many finding aids into a single searchable repository that can be accessed by clicking in a parish boundary. Features include contiguous parish and radius search lists and relevant jurisdictions as they existed in England in 1851. Data includes changes to parishes prior to 1851 and lists of non-conformist denominations in a parish.
(requires Internet Explorer 7, Firefox 3, Safari 3 or newer."
The Project has a very colorful and impressive database, apparently using a Google Maps base. By clicking on a county, you obtain links to a list of all the parishes, a list of contiguous counties, a link to the Family History Library Catalog and a link to a search in the FamilySearch Wiki. The layers of the map includes counties, Civil Registrations Districts, Diocese, Rural Deaneries, Poor Law Union, the Hundred, Province and the Ordinance Survey.
This is certainly and interesting new product from FamilySearch.