this app just came out and here are the details

Microsoft today unleashed their Bing App for the iPhone and iPod touch. The app offers speech recognition of addresses and other features present in Google's iPhone application. It also offers the Bing daily image and related trivia.
Microsoft previously released the Seadragon App for high quality photo browsing. They have other apps planned as well. Source: 9to5mac Screenshots below, via Boomtown

i just got this app and i have to say it is really nice, im def gonna be using it for searching for a while, and might start to use bing instead of google