WinSwitch for Mac

From wincent:

Apple did a superb job with its new Fast User Switching feature in Panther (Mac OS X 10.3), but for users with long names, the associated menu item is a terrible waste of precious Menu Bar real estate.

Wouldn't it be nice if you could access the feature through a compact, icon-sized Menu Bar icon? WinSwitch does exactly that, closely matching the performance and style of the Apple-provided menu, but without all the bulk. In fact, it even corrects some problems with Apple's menu by eliminating certain "daemon" users which shouldn't show up in the list, and by improving the alignment of user icons in the menu. WinSwitch gives you rapid access to the Accounts preference pane, and is completely customizable, allowing you to choose from six different menu bar styles: Standard icon, User picture, Full username, Short username, First name only, and Initials. You can also optionally display the root user, define a hot key to take you back to the login window, and adjust the size of your user pictures both in the menu bar and inside the menu itself. For power users, WinSwitch can automatically run applications and scripts of your choosing whenever you switch in or switch out.