SearchCrystal is an interesting way to visualize results from different search engines. The results common to more search engines are placed closer to the center of circle and have special icons that indicate the search engines. You can use this visualization to compare search engines, to find the rankings of a site or just to discover less common web pages.
SearchCrystal also lets you view image results, videos, news and blog posts from the most popular specialized search engines, but the overlaps are less frequent here. Unlike most meta-search engines, SearchCrystal lets you view all the top results in a single page and you can also embed it as a widget in your blog. Unfortunately, the site is pretty slow, so I preferred to include a screenshot instead.