http://www.seochat.com/seo-tools/search-engine-keyword-position/

This search engine keyword position tool will check the search engine result pages of Google, Yahoo and MSN to see what position your site holds for a particular keyword phrase.

To use this tool enter your search term and the web page URL along with generated captcha and hit submit button. If your given keyword is ranking in any of the top search engine pages then it will display the position number else it will say 'Not in top 100'.