This is a interesting website. You can make a search and compare the result found in Google and Yahoo.
You only need to fill in the search term and click the button. It will perform search on two search engines.
The result shown in a graphical representation. It shows the top 100 search result from both search engines.
The search results are represented in a dot from left to right. The highest rank is put on the left.
The line link between two search engines represents the result are the same.
When you place your cursor on top of the dot, it will shows you the URL. You can click on the dot and jump to the website.
You can use this picture to have some ideas how the search result ranks in two search engines.