Ninja Content Timer allows you to display or hide up to ten links based upon the amount of time that a person has been registered for. This gives you the ability to periodically release content or teasers for subscribers, in a similar fashion to an autoresponder. The links can be to anything on or off your site, to content or even to other websites. You can also hide content at timed intervals as well giving you full control over your content. Changelog & Features: Version 1.1 * Include any type of link * XHTML 1.0 and CSS Valid * Links can be given a start and end display time, measured in days since registration.

Read more at: http://extensions.joomla.org/component/option,com_mtree/task,viewlink/link_id,4696/Itemid,35/