using the latest build of WPMu. I had an issue, though. There’s an admin bar plugin tucked away in the wp-admin to bring it closer to regular WPs functionality. The issue is that the bar displays options that are already in the sidebar. Plus, it blocked my turbo (GEARS) options. If you don’t like the [...]

This hack will automatically add the space required to include your mu admin bar. Add
body {padding-top: 28px !important;}
to the admin bar style and you are done.
Found in the source code of any wordpress.com blog!