Had the guy on my service desk that handles all of the user creation come to me recently with this request.  Well when I say recently it was like a month or two ago, but you know how things go.  Anyhow I threw this script together rather quickly to copy the group membership of one AD user to another.  The basic breakdown is I ask for admin creds, prompt for what customer we’re dealing with so I know what DC to point to, specify the source user you want to copy, specify the target user you want to copy to, and finally confirm you’re sure that’s what you wanna do.  Simple!