If Voice is what you feel using all the time, specially if you have a headset on all day, Speechify extension for Chrome is one stop extension for you and it ads voice capability to any search box i.e. Google, Bing, Hulu, Amazon and search tool implemented on your website using them. It also now supports sending update to twitter using voice on Web version.
The best part is if you have Google Instant turned on, you will see the search result as you speak. However you will be still limited by your accent, how well you speak and how clearly you speak. Though speech search is picking up every where, search on move in a noisy place is still an issue. Speechify uses HTML5 Speech Input which will soon be seen in Chrome. Download Speechify