Google's built-in voice search is pretty handy, but it's even better when you can initiate it with a keyboard shortcut so you never have to to touch your mouse.
To initiate Google Voice Search, just head to Google in Chrome, and hit Ctrl+Shift+. (or Command+Shift+. on a Mac). When you're all done, just hit Esc, and the search will start. Handy.
Keyboard Shortcut for Google Voice Search [Google Operating System]