From Chris Sherman at Search Engine Watch :
Yahoo has rolled out a nifty new tool that lets you use content you're viewing as the basis of a search query, providing results that are difficult to get otherwise without using advanced search commands.
The new tool, called simply Y!Q, lets you use all or part of a web page you're viewing as the source of a search query. Simply highlight relevant portions of text on the page and run a "related search," and Y!Q analyzes the page, extracts the most relevant concepts and uses those as inputs.
Internet Explorer users can download the Y!Q DemoBar ...