How to exports memebers of Active Directory group
There are a lot of scripts floating around to export members of AD group. Following is one way of displaying first and last names via command line
dsquery group -name <name_of_the_group> | dsget group -members | dsget user -fn -ln
To learn more about dsquery and dsget, please see http://technet.microsoft.com/en-us/library/cc732952.aspx, and http://technet.microsoft.com/en-us/library/cc755162.aspx.