The Backflip now uses Google search as the default search engine and includes Google voice search.
You can start a search by typing on either the hardware or virtual keyboard.
You can also initiate a voice search by long pressing the the search buttton in the upper left corner of the hardware keyboard when it is open.
Search interface:
Google Voice Search input active:
Another option is to set the double tap home launch shortcut to open the voice search app:
