Search engine and online advertising giant, Google Inc, finally unveiled its highly anticipated smart phone, the Nexus One . Image by http://www.flickr.com/photos/abulhussain/ / CC BY 2.0 Operating in Google's open source software platform, Android , Nexus One is often tagged as a Droid Plus because of its similarity to the Motorola Droid that was released last year. Unlike Motorola Droid though, Nexus One does not have hard buttons but simply relies on touch screen keyboard like its rival, iPhone.