Several times in the past I thought about removing ads from my blog. I always concluded that they might as well stay, because practically everything on the web has ads, and if anyone doesn't want to see them, it's easy to block them. (For example, if you use Firefox, you just need to install AdBlock Plus and use a filter subscription.) I finally decided to remove them. I don't feel that they're contributing to my blog and I want to make it clear that ad revenue is not my motive here.
I also decided to remove the Google search box. All browsers have a search bar, and so search boxes on pages are obsolete. Plus the one I had did not blend smoothly into my blog's colour scheme. I still think Google is the best search engine; try it and see.