In Lion, the name for the individual logged onto the computer is displayed in the menu bar. Since this can take up quite a bit of room, you can save space by changing it to an icon while maintaining the fast user switching access.
1. Go to the Menu Bar and click on your name.
2. Click Users & Groups Preferences.
3. When the Users & Groups window appears, click Login Options in the left pane.
4. Click the lock in the lower left corner of the window to unlock the options. Input your credentials when prompted.
5. Locate the Show fast user switching as checkbox and click the corresponding dropdown. Select Icon from the list.
Your name will be replaced by a simple icon, while still allowing you to easily access the login window from the menu bar.
If you don’t use fast user switching, you can just uncheck the Show fast user switching as checkbox and save even more room.
