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#10 You can replace your unlock screen with a customized version
Not only can you customize or completely change your launcher and customize or completely change your home screen widgets, you can also completely customize your lock screen. Since your lock screen is the very first at-a-glance use of your phone when you pick it up, being able to customize the lock screen is a key to truly maximizing the productivity of your phone.
In this example, I'm showing an image from a $3 program called WidgetLocker. I've got this installed on my phone (although my lock screen doesn't look this cool yet), and what's nice is that not only do you get this screen, but you still get all the lock password security you expect.
Image courtesy TeslaCoil Software and WidgetLocker.