If you don't like staring at Google's sponsored advertisements, try using Google's "Accessible Search" for the visually impaired. As shown below, the search listings are clean and easy to read. Personally I find the sponsored links to be often more helpful than the search results. Unlike Yahoo!, Google does a decent job of keeping the interface clean and neat, so the sponsored links on the right sidebar don't bother me all that much. But, to each his own.
I am of the opinoin that using this site, even if you are not visually impaired, is not in any way morally reprehensible. It's not like using your Uncle's handicapped parking permit. And because I am visually impaired, I'm in the clear. Suckers.