ThM, of the BoardMod community, has released an update to the New Member Notification 1.0 mod.  Here is an excerpt from ThM's announcement:

Description:
 
This mod allows the administrator to recieve an email when they have a new user that registers of the forum. They have the choice to have the email sent to the webmaster email address or another moderators email address.
If you don't want to receive an notice you can disable these option in your admin panel. See Screenshots.

Features i was add to this version:
 
- Add a checkbox for enable/disable notification email.
- Add more information to the notification mail
- Add new language strings
- Changing email style