Android, Windows Mobile and the iPhone all have a home button that does pretty much the same thing. While iPhone ends there, Windows phones have a search button and a back button.
Android adds a menu button that brings up a menu in any application that is open. This allows powerful and fast access to settings that can only be accessed from separate settings menus on the other platforms. The back and search buttons on both Android and Windows are fantastic for navigation and only take a few hours to get used to.
Oh and that dedicated camera button on Windows? Some Android devices have it and some don't, but it's nice to have a choice.
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Last updated November 08 2010: 2:25 PM ET