The page width doesn't fit on my screen, I have to scroll left to right, try to squeeze everything to the left, or decrease the width of your welcome text paragraphs.
The dark blue background and white text in the google ads isn't good. Choose a completely white background with the ad text in blue or black. The ad text will stand out more and still blend in with the white background on your page.
Since you have a link to DNForum, you may as well join the DNForum affiliate program and use an affiliate link - that way if someone joins from your link you'll earn a commission on anything they buy here. Look at the top of this page in the red bar for the affiliate sign up. Do the same with Sedo if they have an affiliate program.
Instead of a Google text link box (the second one down on the left), I would use the 468x15 style and put it under your logo / above the first paragraph.
I would add a Google search box near the bottom of your page, above the visitor counter.
Google allows three ad boxes and it looks like you are only using one. I would add at least one more, maybe on the left under your menu. Maybe a 160x600 or 120x600. Use the same white background and blue or black text.
The basic layout of the site is good, nice and simple, not cluttered. White background is great. Keep providing useful content and place the google ads around it and it should look good.