[This is part of the Android Diary.] One reason the Web succeeded is the generally well-designed user interface of its browsers; good UI design being the exception not the rule. A key feature of that interface, and arguably one of the single biggest innovations in UI history, is the “Back” button. One of the nicest things about the Android phone is that it has one too.
When you’re shifting from application to application and twiddling settings and so on, it retraces your steps. When you’re in the browser, it becomes the browser’s “Back” button.
So far, it always seems to do just what you’d expect: high (and rare) praise for a UI element. I’ve only had this puppy a few days and my right thumb has totally memorized it.