I need for a registered user to have access to a menu were they can change which groups they are a part of. This extenstion needs a little work, especially for a 75 dollar price tag.

Hi,

We are in the process of including this feature in release 2.0 which is expected to release on end of March 2010.

In a nutshell.

1. Administrator can create groups in the frontend/backend
2. Front-end registered users can choose any group (multiple) and Join
3. Administrator can send SMS to the group fron frontend/backend

Note: This will work well only if you have only one administrator has a valid SMS Account.

Regards
Malai