I don't know if you changed the layout since the start of the reviews but the current one looks very good to me. You could benefit from running YSlow as well. AdSense is better within the posts itself unless you are concerned more with the user experience. I would probaby add the related articles on the right hand side. That tends to increase the amount of time a user spends on your site quite a bit.
Good start. Needs new logo and upgrade the theme, very basic especially for the sector your after, your blog is up against a lot of stiff competition with outstanding site designs.