Aah, very useful site...i can see you growing a general reader base for this...keep up with the good flow of content and some marketing and you'll do great... Site design is less important than the above...but does have some impact, but generally it's fairly ok...but room for improvement..
Very nice, the only change I could see would be the color of the Adsense text. I found it hard to read the black text on my monitor, and so gravitated away from the ads right away. Otherwise it's a nice clean look with good content.