Amir,
I think you're really onto something with your content. I think you've got all the right pieces and parts. Some calls to action, some longer descriptive, teasers, partial commits(the newsletter), and your bio stuff(credibility). I think your copy is good and I enjoyed reading further.
But, like some of the other reviewer's mentioned, the visual style and layout is a little hard to follow, or maybe another way to say is that the eye struggles a little to scan the page.
This is very subjective, and I don't have any credentials, but I've noticed that I don't mind reading or scanning down blocks of text, when I can clearly see the calls to action or product offers presented graphicaly to the side or top of the page. I am at ease since I've got the navigation easily understood at a glance, and my eye can rest on the text while I'm deciding whether I am further interested. I think sites like SitePoint.com do a good job of this and I find myself signing up for newsletters, then getting tempted to by the book.
I'm struggling to understand what good design is about, but some recommendations that I liked from other sources include.
Use sans-serif type on the web. Contrary to print recommendation, but I believe serif type is dated on the web.
Limit font size, bolding, italics to a very few variations.
Use pleasing colors and whitespace.
I think with some good graphics and more modern typography, you could really have a winner as personally I found your content very interesting. I think your calls to action and teaser offers are fine, and you have some good credibility in your bio information to make the offers come off legit. I think some of the info is just getting hidden and explains some of the other reviewers reactions.
I'm also looking for feedback on my site,
www.okfoundrycompany.com, posted just below yours.
Cheers,
James