The Action Streams plugin is an amazing new plugin for Movable Type 4.1 that lets you aggregate, control, and share your actions around the web as well as a list of your profiles on various services. With the Action Streams plugin you keep control over the record of your actions on the web. And of course, you also have full control over showing and hiding each of your actions. The Action Streams plugin, by default, also publishes your stream using Atom and the Microformat hAtom so that your actions aren't trapped in any one service.
If you already have a Movable Type blog, it's pretty straightforward to add your action stream to your site. You can already see it in action on a number of sites, like Movable Type's Product Manager Byrne Reese's personal blog. If you're not yet running Movable Type, you can grab all of this functionality for free with Movable Type Open Source which just shipped its first stable release. You can see a completely free implementation on our Open Platforms Tech Lead David Recordon's site as well as on our VP of Product Michael Sippey's site. The plugin also ships with a Template Set (a new feature in MT 4.1) which allows you to create an action stream in just a few clicks.
See the additional streams you can add in the Action Streams section of the plugin directory.
For support on this plugin, check out the code.sixapart.com project support forum.