DesktopX 1.1 will be the first public Stardock product to support the new SDPlugin specification. A plugin made with this plugin spec will work on ObjectBar as well and in some cases WindowBlinds.
If you're a developer, visit the linked page to see some examples in action along with the SDK. There are some extremley cool things you can do with plugins and it's a great way to write software that will get used by thousands.