Georgia Property Tax Digests

For those of you who use Ancestry.Com.  They recently updated their Georgia Property Tax Digests. http://search.ancestry.com/search/db.aspx?dbid=1729  You can narrow your search by location, i.e. Robert Jones in Cobb County.  You can also browse the records. For Cobb County they have the following years:
1848
1849
1851
1873-1877
1878-1880
1890