With the new iPhone SDK, it's just a matter of time before we see a wave of new applications. We expect a lot of popular web 2.0 apps to offer an iPhone version. Native Twitter, Facebook and Flickr clients for iPhone will run faster than their in-browser versions and will take advantage of the impressive Apple UI libraries. But there is an entirely new breed of applications also coming to iPhone. These apps simply would not be possible without a device like iPhone. The major theme of this new wave of apps will be blending of the physical and digital worlds , using iPhone as the bridge. In this post we take a look at what's coming. 1. Reality Tagging Tagging reality is not new, but will be much better done with iPhone. Here's how it will work. You take a picture of a landmark, then comment and add tags. The phone will automatically geo-tag it and send the picture to a photo sharing service on the Web. Now anyone in the world can find your picture by exact geo locatio...