The amount of genealogical information on this site is not huge but inpressive in it own right.
The Roy Bird Cook collection of the 31st Regiment of the Cofederate State Army is excellent. The images are "jpg" format and easily viewed with any browser. This collection has over 3000 documents from the regiment that was composed mostly of western Virginia volunteers and served in many major conflicts during the course of the Civil War. You will find orders, accounts, muster rolls, and correspondence, as well as a history of the regiment by James Dell Cooke.
If photographs are of interest to you, the West Virginia History OnView: Photographs From the West Virginia & Regional History Collection is certainly a must. This on line group is supposed to contain about 6,000 photos from a much larger collection. But, I will have to take their word for it. I haven't looked at every one.