Remote Your Cam USB Lite Remote Your Cam USB Lite

the author of this app says:

Remote Your Cam USB allows you to control your Canon or Nikon DSLR camera from your Android 3.1+ device through USB.

Please note that this application is still in Beta phase and there may be issues with your camera!
We are releasing early to get initial feedback and input from you for future releases.
Contact us if you have any problems.

Features Lite
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* Control of the following settings:
** Shutter speed
** ISO sensitivity
** Whit balance

Features Pro
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* Live View
* Histogram (Canon only)
* Lens control
* Control of the following settings:
** Aperture priority
** Color temperature

and more ...

Requirements
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* Android 3.1+ device supporting USB Host
* Canon or Nikon DSLR camera
* USB cable to connect them both

Head over to http://www.remoteyourcam.com/usb/features to check the compatibility with your DSLR camera and Android device.
The Userguide at http://www.remoteyourcam.com/usb/userguide helps you to get started.