Nikolay Kropachev has introducedAmbiLauncher for Mac OS X 10.7 ("Lion"). The US$0.99 app allows you to launch applications by moving the pointer quickly to the left or right edges of the screen and back. It's available at the Mac App Store in the Productivity category.

The screen boundaries are divided into sections of different colors. One movement of the cursor to each section of the screen and back launches the application. You can edit the color, size, and position of the sections. The assigning of applications to each of the sections is done in accordance with the applications' names.

You can also edit the width of the sections on the screen border and their transparency. When the cursor stays near the screen borders for a long time, the sections disappear and don't interfere with pressing buttons, scrolling or watching the video in full-screen mode.