Here is a real simple concept, a search engine with big text. That is what big.com offers; huge letters, large links, and an impossible to miss "Search" button. Big.com experienced a 69% increase in visitors during January. Perhaps web surfers with vision problems find this search engine to be the easiest to use.
An estimated 1.41 million US internet users visited big.com in January, 2006. To put things in perspective, in that same period google.com saw roughly 115 million US internet users. Though it is growing, big.com is relatively small. On a side note, you can change the text size on any Web page simply by clicking "Text Size" in the "View" menu.