Mac only: Multiple monitors do great things for your desktop space, but your menu bar sticks to one screen. If you're looking for more menu access, free utility SecondBar puts one at the top of each monitor.
As veteran Mac users know, each application's menu fills in the menu bar at the top of the desktop, not the window of the app itself, as in a Windows desktop. When you have a lot of apps open in different spots, it becomes inconvenient to access an app's preferences or deeper features with a mouse. SecondBar adds a customizable menu bar to your second, third, or tenth monitor, letting you keep your focus on one screen at a time.
SecondBar has all the features of OS X's built-in menu bar, along with being drag-able and having the half-and-half resizing features of Windows 7's Aero Snap. The app is still in its super-early development stage, but it seems stable enough for regular use at the moment, and more features appear in the works.
SecondBar is a free download, Mac OS X only. Thanks, Douglas!