Microsoft has just made Bing [Free - iTunes app] their second iPhone and iPod touch app (no, Office wasn't first -- that's still MIA -- the amazing image-zooming Seadragon was), and it's fairly impressive. It takes a lot of the services Google powers throughout the iPhone and the Google Mobile app and collects them all in one place -- internet text string search, image, movies, a business directory, news, and maps and directions. You can also do Voice Search though without the accelerometer and proximity sensor tricks that make's Google's version so Star Trek.
The Bing app is great looking as well, with large photo backgrounds a la Bing website (and yes, you can tap the rounded square overlays to get factoids). Text string searches are pretty much on par with Google, sometimes returning more sensible results in more logical orders, sometimes not. A simple image search for "theiphoneblog bing", however, returned no results from the Bing app, and exactly what I was looking for in Google. (see below). Likewise, Voice Search tended to crash the app when it went into "thinking" mode. The business and other directory-style information is great, as usual with Bing.
If you're interested in comparing Microsoft's own Windows Mobile version, our buddy Phil from WMExperts has you covered. If you're wondering why Microsoft made Bing for the iPhone, despite Steve Ballmer cracking wise about the iPhone and the internet, Apple's platform enjoys a huge share of the mobile browsing space and Bing wants those eyeballs as much as the just-as-competitive-now Google.
Screenshots after the break!
[Bing via Thurrott]