It seems an obvious idea, but it took a long time to come to reality ‘ a mobile browser that reflects a mobile user interface rather than being a squashed-down version of a desktop one. Opera Software, always the most innovative in the mobile browser world, has released Coast, a browser specifically for the iPad, which has a grid of icons. The product started as a single-person programming project 18 months ago and has now made its commercial debut, replacing the traditional address bar, bookmarks and tabs with icons to represent web pages, search box and other functions. As tablets start to replace PCs, the old user interface must be reworked, argues Opera, maintaining the disruptive mantra it has always…