Ancestry have added two major record collections - Dorset Parish Records, 1813-2001
and Dorset Wills and Probate Records, 1565-1858
I haven't personally found any ancestors from Dorset so far and I'm feeling pretty envious of anyone who does have connections with the county as I'm sure these records will prove extremely helpful.
Ancestry have also completed the first stage of their 1911 Census release. Members can log in to the site and browse the scanned record images from all over England, Wales, the Channel Islands and the Isle of Man.
At present, it's not possible to search the records as you would with previous censuses. They've already started work on the transcriptions and are on track to have them all finished by the end of the year. In the meantime, you can browse the records by county and civil parish. This page
shows you how.