I hope this is just a fluke, and my problem and not yours, but clicking on your Dashboard link redirects your page to http://mattread.com/archives/2005/03/wp-admin-bar-20/ which is the link for the WordPress.com Admin Bar that WordPress.com bloggers see at the top of their WordPress.com blogs (and others) while logged into WordPress.com.
To access your WordPress.com blog’s Dashboard and Administration Panels, manually type in the URL:
Enter your username and password if you logged out and you will be back to running your WordPress.com blog.
I’ve reported this through the Feedback link in the Administration Panels. Hopefully this will be fixed right away.