This weekend, Kevin Shay, the developer behind several of Movable Type's most popular plugins, release the first Movable Type 4 plugin. Some credit should go to Arvind as well who has been working on upgrading Custom Fields to work with MT4, but Kevin's plugin represents a truly original MT4 idea.
Bookmarks is a plugin that allows users to maintain a list of bookmarks to any page in the application. The list is easily accessed through a "Bookmarks" menu, which is used for managing and adding items to the list as well.
In addition, each user can maintain their own set of unique bookmarks, turning Movable Type into a much more personalizable application. Major kudos to Kevin Shay. Now we need to launch our new plugin directory so that plugins like Kevin's and Arvind's have an equally awesome home to be listed and promoted.