"Unlike the Logitech mouse, Point&Scroll does not depend on XY coordinates, thereby able to scroll all windows, including those partially visible .
Point&Scroll also has a variety of configurable settings for the Mac users (including contextual menus...yes), and a developer API. For older Mac users, Point&Scroll can be purchased with XLR8's (soon released) DualPort USB for PCI. These guys end-up with USB connectivity and cool point & scroll capabilities."
No word yet on pricing information or availability.