Autodesk Sites
Autodesk Inventor Discussion Group:-
http://discussion.autodesk.com/forums/forum.jspa?forumID=78
AutoCAD Discussion Groups:-
http://discussion.autodesk.com/forums/category.jspa?categoryID=8
AutoCAD Mechanical Discussion Group:-
http://discussion.autodesk.com/forums/forum.jspa?forumID=39
Autodesk Inventor Graphic Card Drivers:-
http://www.inventor-certified.com/graphics/findDriver.php
Autodesk Labs
labs.autodesk.com
CAD Forum Sites
mCadForumshttp://www.mcadforums.com/forums/
Eng-Tips
http://www.eng-tips.com/threadminder.cfm?pid=790
CadTutor
http://www.cadtutor.net/forum/index.php