You should try to get rid of that empty space above the google ads. You should also try and include a small google ad unit before your first post to get your some more revenue from your front page. (white background and purplish text so it blends in with your content). I think the skyscraper is a little bit too visible also.. it's way too obvious to visitors that its an ad because of the colors and separation from the other content... you should try to blend it in with your main content to improve your CTR. Other than that the design is fairly visually appealing.. but is in need of some touch ups to make it more inviting to the user so they sign up for your free hosting.