Gest

Program: Gest
License: Open source

Description:
From Gest website:

Gest is a small, portable and free program which runs from the system tray. It adds mouse gesture support for Windows Explorer, like those that you see in modern web browsers. These allow you to perform simple tasks by holding down the right mouse button and drawing a few lines which are interpreted by the program which then sends commands to Explorer. These include simple things such as moving backwards and forwards or opening a new window. Mouse gestures improve productivity and are easy to use. The gestures in 'Gest' are fully customizable and can be changed from the settings window.

It is written in AutoHotkey, source is avaliable here. Gest is not available in PortableApps.com Format.
Download here single .exe file.

Website: dl.dropbox.com/u/7803192/bambi4/Gest.html

Screenshot

Other apps (also portable, but not in PA.c Format) by bambi4 can be found at bambi4.co.uk