On a large monitor with a high resolution the site does not look good, you should get a professional template.
I'd give the page some margins at the edges. Also, the posts could be wider since you have a wide gray area between the posts and the right sidebar.
The content of the blog looks decent but its look more like hacking site (by the color and theme of the website) Try to change the template or at least the colors .
Indeed it looks like a hacking site. In my opinion, the posts column is better to be wider due to the long post. Maybe you can reduce the sidebar number to 1 or 2 by using blogger template that offer you 'tabbed menu' for your recent comments, recent posts, and archives. I mean it's like a mini menu on your sidebar with minimal space usage.