Explicit angles instead of Expletives for angles

New to the upcoming Inventor 2009 is an option in the "Angle" assembly constraint called "Explicit Reference Vector". This allows us to define a direction perpendicular to the rotation direction and thereby enforce the "right hand rule". Check out this video for an example:

http://www.screencast.com/t/gZfdQ0dj

Contributed by Ben of the INCAT CAD Geeks.