Hands down, one of my favorite records to use is the Index to Marriage Bonds Filed in the North Carolina State Archives, 1741 – 1868. If you can’t make it to the State Archives, the best way to access this record is to find a library that houses it (many in North Carolina do) or to view it using Ancestry.com.
This index is, as far as I know, only available on microfiche. It’s made up of numerous sheets containing both groom and bride indices, alphabetized by surname. Each item may contain the names of the bride, groom, bondsman, and witness, the date and county in which the bond was taken out, and the record number. It may also give additional information, such as a parent’s name, or may point to additional information given on the bond itself.
This index is particularly useful for anyone whose ancestors moved through North Carolina, either from county to county or to and from other states.
For more information on the history of this work, see Overview of Marriage Bonds Filed in the North Carolina State Archives. This item is available for purchase through the North Carolina State Archives.