Review Some Useful Tools For iPod/iPhone

After I got my iphone, I'm finding some accessories for it, it's iphone 4s.

First, iphone case, the unique case to protect iphone safely. I think, this is the Essential part for
iphone.

It's ID Credit Card iPhone case  combines a wallet and protective case, can be used for iphone 4 and
4s.

Second, Stand Amplifier Speaker for iPhone, this stand is recommend from my friend.

It holds iPhone 4 vertically and horizontally, functions well in hand-free mode. Anyway, I got it
$10.95, not alway use but convenience.

The last one is Iphone/iPad/iTouch Controlled RC I-helicopter, do you know ihelicopter?

This RC Helicopter can be controlled by iPhone, iPad or iPod Touch, it's 3.5CH and New ihelicopter.
All you need to do is download the controller App and plug in the transmitter. A full metal body
increases the strength of the helicopter and prevents damages upon crashes.   
Share the iphone controlled app with iphone users, if you need, download it here.

Anymore, do you which one is my favourite? ummmm, the last one.

I collect some video of it, below

what's your iphone accessory?