Here’s a quick way to access your recently added virtual machines in your VirtualBox using Unity Panel indicator.
VirtualBox indicator helps you to easily access your recently added virtual machines without running VirtualBox window, it takes you directly to the virtual machine you selected from the menu. Also you can run VirtualBox main window from the menu as well.
sudo add-apt-repository ppa:michael-astrapi/ppa
sudo apt-get update
sudo apt-get install indicator-virtualbox
Tested with the latest version of VirtualBox 4.1 working fine