The latest versions of Google Chrome 9 and above have support for voice input, but it’s not enabled by default. If you have enabled voice input in Chrome, then you should be trying out the Voice Search extension for Google Chrome. Voice Search provides a method to search by speaking. For example, to search for Windows 7, just click on the microphone and say “windows 7″. If you specifically want pictures of Windows 7, say “Google images windows 7″.
Voice Search comes pre-loaded with the following default services: Google, Wikipedia, YouTube, Bing, Yahoo, DuckDuckGo and Wolfram Alpha. You can also add your own user-defined search engines or any website. It also integrates a speech input button for all websites using HTML5 search boxes, all of the default search engines’ websites, Facebook, Twitter, Reddit, and GitHub.
This extension requires a microphone. Speech input is an experimental feature, so it might depend on how you pronounce the words.
Voice Search a nice extension worth trying.