Less than two full days after Steve Jobs announced that the iPhone would work with third-party Web 2.0 applications, the first iPhone web apps have appeared. One, created by David Cann, is an iPhone interface for popular social content site Digg. The interface appears within a mockup image of the iPhone, and lets users “flick” to scroll up and down. Another app, OneTrip Shopping, is a grocery list program built by Neven Mrgan that allows users to sort through various types of food and sundry items, and add them to an editable list. As we reported yesterday, developer reaction to the announcement of Web-based third party apps for iPhone has been mixed.