Here are few places with great info:

http://knowledge.autodesk.com/

http://www.cadtutor.net/ 

http://www.cad-notes.com/

http://cadablog.blogspot.com/

http://www.lee-mac.com/ 

http://www.jefferypsanders.com/ 

http://mycadsite.com/

http://cadtips.cadalyst.com/

http://cadpanacea.com/

https://www.theswamp.org 

http://cadsetterout.com 

http://ltisacad.blogspot.com/ 

http://cadintentions.com

http://cadanswers.com/

https://autocadtips1.com/

http://www.caddmicrosystems.com/blog/

https://geauxcad.wordpress.com/ (lisp library! and good links)

https://thecadgeek.com/

http://thecadcafe.blogspot.com/


Blogs

http://lynn.blogs.com/lynn_allens_blog/

http://rcd.typepad.com/rcd/

http://www.seemsixty7.com/blog/blog/

http://www.blog.cadnauseam.com/


Autodesk product team blogs

In the Pipes - http://in-the-pipes.typepad.com/in_the_pipes/ (Plant 3D etc)

Civil Immersion - http://civilimmersion.typepad.com/ (Civil and AEC)


 

http://jtbworld.com/cad-software-information (looks like important information for those frisky enough to tinker)


 

Other Podcasts

http://www.civilfx.com/category/podcast/

http://www.podcading.com/the-show/ Jason is taking a break. Show can be found here https://www.podomatic.com/podcasts/podcading

http://cadthoughts.com/

http://simplycomplex.sharedcoordinates.com/

 

Non CAD specific podcast 

http://www.unprofessionalengineering.com/ 


Drafting

https://ocw.mit.edu/courses/mechanical-engineering/2-007-design-and-manufacturing-i-spring-2009/related-resources/drawing_and_sketching/ MIT


 uh... related i guess

https://www.fourmilab.ch/autofile/ - a history of Autodesk