X-Mouse Button Control

Product: X-Mouse Button Control v1.49
Company: Highresolution Enterprises
Website: www.highrez.co.uk
Type: Free
Requirements: Windows 2000/XP/Vista/7

X-Mouse Button Control is a windows application to remap your mouse buttons. You are able to provide an application specific mappings, which means one application can use the mouse differently from another. This is useful for games which do not inherently support the extended mouse buttons, because you can map keys to each button. 
What´s more, the list of functions available to map to is somewhat more comprehensive than the 32bit MS Intellimouse Software can handle, including things like: Volume Up/Down/Mute; Media Player control; Send a custom keystroke sequence; and Launch an email application.