http://www.nirsoft.net/utils/my_last_search.html

MyLastSearch utility scans the cache and history files of your Web browser, and locate all search queries that you made with the most popular search engines (Google, Yahoo and MSN). The search queries that you made are displayed in a table with the following columns: Search Text, Search Engine, Search Time, Web Browser, and the search URL.
You can select one or more search queries and then copy them to the clipboard or save them into text/html/xml file