@Ken1 I updated the Label to Report Center as your question will likely get more traction there.
How will you distinguish the new users from existing users?
eg. You check for all users that have been changed in the last 7 days
Select Top 1000000 tblADusers.Username,
tblADusers.Userdomain,
tblADusers.Firstname,
tblADusers.Lastname,
tblADusers.Name,
tblADusers.Displayname,
tblADGroups.Name As [Group],
tblADusers.whenCreated,
tblADusers.whenChanged
From tblADMembership
Inner Join tblADusers On tblADMembership.ChildAdObjectID =
tblADusers.ADObjectID
Inner Join tblADGroups On tblADMembership.ParentAdObjectID =
tblADGroups.ADObjectID
Where tblADGroups.Name = 'Domain Admins' And tblADusers.whenChanged Between
GetDate() - 7 And GetDate()
Order By tblADusers.Userdomain,
tblADusers.Username