The program is so widely used that there are blogs, chat rooms and home grown websites dedicated to it. Often the resources you find will be relevant to one version of AutoCad or another. For instance, there is a tutorial for AutoCad 2000 that was put online by a professor in the University of North Carolina Graphic Communications Program at http://www.ncsu.edu/project/graphicscourse/gc/acadtut/acadtut2000/acadtut-home.html
CADdepot is a website devoted to AutoCad shareware and freeware authored by software writers who use the program. You can download a wide variety of software tools that enhance various AutoCad functions. The website has been up since 1994 and has been serving the online CAD community as a repository of CAD shareware, demos, free utilities and add-ons. You may freely browse the library but you must register before you are able to download. http://www.caddepot.com/
