I have the Accomack County tax list on my site. It has a great deal of information about many families--especially in 1813 when all free people above the age of 16 were listed.

I see the Library of Virginia now has the Register from 1807 to 1863 on interlibary loan. I will probably get to that by ordering it at my local county library. (You can do as well). If you care to wait, I will eventually order it and post it on my site.
Paul