The difference between articles and blogs is not much technically. I mean they both allow large amounts of text as well as file attachments - which is sometimes all people need. However the article system also handles content revisions, reviews, and the ability to have multiple contributors.
The idea is that blogs are more for expressing yourself and telling your experiences in the electronics world to other like minded people. Blogs usually contain ideas, thoughts, views. The articles section is for complete, accurate pieces of information such as circuits or tutorials that have been tested.
With regards to copyright, I believe that articles and blogs are very much your own and you yourself have full permission to create/modify/delete any information in both of these places. Anything you submit automatically belongs to you and becomes copyrighted to you. With forum posts, it's slightly different because of a problem in the past. A member decided they wanted to leave and they requested that we removed all their posts. A forum is dependant on each post because they are interlocked. We've made it so forum posts are public domain and cannot be removed unless there is valid reason (ie, personal information displaying, personal deformation, etc). However, I don't consider I own them or anything, I mean i've owned this forum for 10+ years and love every part of it. I'm all for public information and love that I can provide this site for free. I also hold a strong obligation to protect the information here and it's members.
One of the mods I'm wanting to make is within each blog and article display a copyright under author information to state clearly that the member owns it.
Hope that clears it all up
I probably ranted a bit more than needed to but it's good to be clear on it..
But if anyone has concerns about copyright, please do post a separate thread in the feedback forum, as this post is mainly about appreciating and noting members like yourself who have contributed to the blogs or articles.