Recently in WordPress.com blog it was stated that users of the IE 9 Beta should be able to “pin” WordPress.com blogs to their Windows taskbar. When a blog is “pinned” to the taskbar, it enables users to quickly launch the blog as well provide them with easy access to common tasks (E.g: Writing posts, moderating comments etc). How is done? The user first signs in to WordPress.com and then does a drag-and-drop of the browser tab into the taskbar. You can also pin blogs belonging to other users to the taskbar in a similar fashion.
Read Full article: http://wpcandy.com/reports/ie9-allows-pinning-of-wordpress-com-blogs