Thoughts one the „Home“ Button:
If you have a Home Button on your Blackberry, you have Home Buttton Envy, it’s a Menu Button really.
The Home Button on Android is like a „show me to a geek home“ Button.
The Home Button on Windows Phone 7 is like a „Home run“ Button.
The Home Button on an iPhone is like a „Home for Dangerous People, there’s nothing allowed in which you might hurt yourself with“ Button.