I viewed my site on iPad, and the WordAd box on the right blocks some of the test on my front page. Here's a screenshot of what I'm talking about:
Interestingly, this only happens on the front page (set to display the seven most recent posts), and not when you click on individual posts. There, the WordAd box is nonobtrusive.
I am using the Twenty Eleven format.
The blog I need help with is rooktopia.wordpress.com.