Invisible Launcher Description:

Invisible Launcher is a configurable program designed to provide
a fast way for organizing and starting up your applications and for
opening the folders, shortcuts and documents which you frequently access.
When Invisible Launcher is not in use it is invisible and does not take
up the the valuable place on your space. When you move your mouse to the
program icon into the system tray, it pops up, allowing you to launch
your applications, folders, shortcuts and documents.
You can add a file, shortcut or folder by dragging it to the program
window, but cannot accidentally drag them off.