Chainfire have announced DSLR Controller that allows control of your Canon EOS DSLR from your Android powered phone or tablet through USB.
DSLR Controller – Android + Canon EOS – LiveView
DSLR Controller is the first and only app that allows you to fully control your Canon EOS DSLR from your Android device with only a USB cable. No computer or laptop required, no root required, only a compatible mobile device, a compatible camera, and the right USB cable.
Features include but are not limited to:
– Live View
– Auto Focus (tap Live View)
– Manual focus adjustments in Auto Focus mode
– Histogram
– Zoom control
– Grid display
– Bulb capture
– Continuous capture
– Extensive modification of settings
— Shutter speed
— Aperture
— Exposure Compensation and Bracket
— Flash Compensation
— ISO speed
— Auto-Focus Mode
— Focus and Zoom area (tap-and-hold Live View)
— Picture Style
— Drive Mode
— White Balance
— Color Temperature
— Auto-Lighting Optimizer
— Metering Mode
Note that available options depend on the mode you have your camera set to (M, Av, Tv, etc)
Read more: https://market.android.com/details?id=eu.chainfire.dslrcontroller