It's pretty sweet and looks awesome.
Now to answer some questions:
Why do I need this?
Will this break my phone?
Don't know. Depends what you use it for.
Will this void my warranty?
Its a non root stock HTC apk
Will it help me find my long lost brother?
Can I get this from the market?
How do I install this?
Log off, turn your computer off and please walk away. Seriously