This CB Team Released Community Builder plugin sends each newly registered and approved member personalized welcome messages via CB supported PMS component and/or Email. It can also automatically create a connection request to or from a prespecified key user. This little plugin is great for Community Building exercises allowing website admins to automatically great new members and send them personalized information needed to get them up to speed with the website. You can see this in action by registering on Joomlapolis.com.
A preview article of the plugin, its parameters and functionality is available in the dedicated forum area on Joomlapolis - http://www.joomlapolis.com/component/option,com_joomlaboard/Itemid,38/func,view/id,26063/catid,37/ !