"unDock Supercharges Your Mac's Disk-Ejecting Functionality" - Lifehacker
Time machine is wonderful, but it makes a mobile Mac user cry- waiting for a backup to finish or cancel before we rush to a meeting makes life difficult. unDock adds a simple but critical piece of functionality to your Mac- an "Eject All" shortcut with super powers.
When you're ready to go, use either the keyboard shortcut (default: Control-Option-Command-Space) or the menu bar icon to unDock. With unDock Lite, each time you use the hot key combination or menu trigger, the first removable disk will be ejected.
Upgrade to the full version of unDock to eject all of your removable drives at once, add support for network drives, and provide your own AppleScripts to run at unDock!