For many years, I have been the administrator of the REDMAN=REDMON(D) surname DNA project at FamilyTreeDNA. The line of Thomas Erastus REDMAN=REDMON(D) (married about 1775 to TAPLEY) is the one major line who have still NOT submitted a representative DNA sample for comparison to others.
So if you have a male descendant of this line who might be interested in doing a DNA test, the genealogy community would be very happy to welcome your paricipation :)
I think there will probably be some matches already in our group who cannot take their line that far back yet.
ancestry.com also provides a DNA test service & I administer the REDMAN surname group there (available to paid subscribers).