Confusion - is it a Blog or an Article or something else?

This could be a matter of semantics but I am trying to put some clarity around what constitutes a blog and what constitutes an article. In a recent feedback session it was noted I had two different sections identified on my site (besides a product section) - a section called "Articles" and a section called "Blogs". Why differentiate the two? Should they be identified differently? Thoughts?

Here is my take, but I would really like to hear from others. I created the "Articles" category to identify my authoritative writings. These mainly include product reviews or something specific to one (or more) of my products. Articles usually are 500 or 1000+ words and are objective in nature.

I use "Blogs" to promote related material to my specific products and services. They are usually 300 to 500 words and subjective in nature. They provide informational content but create though-provoking ideas or stories. I use them as a bonding point with my customers. Once you hook them with something of interest to them personally they may be more apt to look are your products and services.

Should we merge the areas or keep them separate? How are you using these two concepts? Would you use the word "Blogs" or something else that might sound more professional? Or do you use a completely different categorization system on your site?

Would really like to hear from WA folks...

Thanks.