In addition to adding London electoral registers a couple of days ago, Ancestry www.ancestry.co.uk has also added electoral registers for Dorset, covering the period 1839-1922. The collection has been sourced from Dorset History Centre.
To view the collection visit http://search.ancestry.co.uk/search/db.aspx?dbid=2167
There are also lots more Dorset records available there including:
Dorset, England, Births and Baptisms, 1813-1906
This database contains images of Church of England baptism and christening records in registers from parishes in Dorset County.
This database contains images of Church of England death and burial records in registers from parishes in Dorset County.
This database contains images of Church of England marriage records and banns in registers from parishes in Dorset County.
This is a collection of Wills, Letters of Administration and Inventories for Dorset, England, between 1558-1858. These records are primarily parish registers because the church took care of wills prior to 1858. The wills contain last wishes of the deceased and what they wished done with their real estate and other personal property. The Letters of Administration gave a person power to be executor when no will was available and an Inventory was simply a list of possessions and their values. Inventories were required before a Letter of Administration was given.