I found that many CAD resources available on internet. Not only website, but also blogs. Here is the list. You may submit more links in comments, I will add the links on this page. Only CAD blogs or websites please :)
AfraLISP
URL: http://www.afralisp.net
Description: Learn AutoLISP for AutoCAD productivity
AutoCAD Trainer Guy, LLC
Autodesk Blogs
URL: http://www.autodesk.com/blogs
Description: Autodesk blogs feature news, expert tips, and insider resources directly from Autodesk staff.
Comments: A lot of Autodesk staff have blog. And this page have the full list. Many interesting updates here. Find your favorite guy/gal and follow their blog!
Autodesk University Blog Network
URL: http://au.autodesk.com/?nd=blaug_network
Comments: This one is also a list. A lot of nice CAD blogs here. Not only from Autodesk employee, but also from their users. If you have a CAD blog, you might want to submit yours too!
CAD-a-Blog
Description: CAD Tips, Drafting Techniques, Tech News
CAD-Animation
URL: http://www.slashcomputers.com/
CAD Architect
URL: http://www.cad-architect.net
Description: CAD Architect features over 6000 CAD Symbols, Drawings, Details and Building templates available to download instantly and is a one-stop CAD resource library for Architects, CAD draughtsman & other related building industry professionals.
Comments: Well, library or reusable content is always needed. You can download a lot of reusable content here. Not for free, but I think it’s relatively low price. You can pay for membership, and download what you need!
CAD-Becker.de Blog
URL: http://www.autocad.cad-becker.de/
Description: Blogs zum Thema AutoCAD und weiteren Autodesk Produkten
*an AutoCAD blog written in German.
CADDManager
URL: http://www.caddmanager.com/CMB/
Description: Practical, proven insight into CADD Management from Mark W. Kiker
The CAD Geek
URL: http://www.thecadgeek.com/blog/
Description: Empowering CAD Professionals
CADKlein
Description: The largest portal on AutoCAD in Brazilian Portuguese, news, forums, downloads and more.
CADman-Do
URL: http://cadman-do.blogspot.com/
Description: David Cohn CAD and personal blog
CAD Panacea
Description: CAD Panacea is a website/blog by R.K. McSwain from Houston, Texas.
CAD Professor
Description: A Blog dedicated in teaching Autodesk Inventor with guest authors from Autodesk Labs
CADRelations (in German language)
URL: http://www.cadrelations.com (news portal) | http://www.mcdcad.eu (blog)
Description: Cadrelations is the CE based Multimedia News Portal for Engineers, with over 190-Hours of Videotraining material of Autodesk Products
CADTutor
Description: Free AutoCAD resource and forum
Civil 3D Peanuts
URL: http://c3dpeanuts.wordpress.com
Description: This blog has AutoCAD Civil 3D related topics and is therefor a contribution to the Civil 3D community
Daily AutoCAD
URL: http://www.dailyautocad.com
Description: Tutorial, articles, news and downloads about AutoCAD every day.
Comments: Daily AutoCAD has become many AutoCAD users favorites. It is also listed as Top 10 AutoCAD Blogs by Shaan Hurley.
Envision CAD
Description: Resources for MicroStation and InRoads users and some information on Civil 3D.
Comments: This is not a free resources. Most of the materials and services are need to be purchased. However, there are newsletter and tips that you can get for free.
HelpCAD
Description: HelpCAD is the place where you’ll find technical support and share your ideas for CAD softwares
IMAGINiT Manufacturing Solutions Blog
URL: http://rand.com/imaginit/manufacturingblog
This is a blog dedicated to Autodesk Manufacturing users. Very good stuff. I like the technical details. All tutorials, tips, and tricks is very good. Don’t miss it, especially you, Inventor users!
Indy Drafter
URL: http://indydrafter.com
Description: Good resource for tips and tutorials on AutoCAD features. I also post a lot of relevant information about the current happenings in the world of Autodesk and AUGI as well as local AutoCAD related events in the Central Indiana area.
John Evans Design and Motion
URL: http://johnevansdesign.net
Description: Tech articles related to Autodesk product interoperability, Digital Prototyping, Motion Design and Manufacturing.
JTB World Blog
URL: http://blog.jtbworld.com/
Description: Software development and Consulting – CAD, AutoCAD, AutoCAD Architecture, VB.NET, VBA, AutoLISP, databases, IT and more
The Kungfu Drafter
URL: http://www.kungfudrafter.com/
Description: CAD centric, Geek peripheral
LT is Still AutoCAD
URL: http://ltisacad.blogspot.com/
Description: Tips and tricks to get the maximum out of the most minimum of AutoCAD Versions
Mistress of Dorkness
URL: http://www.thecadgeek.com/blog/
Description: This platform will be primarily dedicated to Design Technology (especially as it relates to Facilities Management [FM / CAFM]), but, when other topics catch the blog owner fancy, she’ll post about them as well.
RobiNZ CAD Blog
URL: http://rcd.typepad.com/rcd/
Description: Robin Capper’s CAD (Computer Aided Design), BIM (Building Information Model), Design and IT related interests!
TheSwamp
Description: TheSwamp is a friendly community of programmers, designers and drafters who share ideas, resources and information in a friendly, helpful context
TenLinks.com
URL: http://www.tenlinks.com
Description: directory of CAD, CAM and CAE resources.
Xanadu CAD Forum
URL: http://www.cadforum.cz
Description: Hundreds of tips and tricks for AutoCAD, Inventor, Revit and other Autodesk software. CAD blocks, CAD utilities and videos for download.
Xanadu CAD Blog
URL: http://budweiser.xanadu.cz
Description: CAD blog by XANADU.
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Application Engineer. Jakarta, Indonesia.
5+ years experience as CAD engineering application. AutoCAD, MicroStation, Inventor, Autodesk Revit Architecture 2010 certified professional, and certified CATIA part design specialist. Here are some topics I am currently focusing on 
