dslrController, in the Android market. Read either the info there or on his site about limitations concerning Android devices that work. It was just "updated"for some wireless capabilities.
It has been $8.50 for a long time and is in "Beta". When I got it, purchase guaranteed that you could have the final release for no extra $$. Completely worth $8.50 to first time you use it.
I have used it on a few little tethered product shoots to be simpler than attaching the full size laptop. The software allows easy bracketing and shows the view through the lens. Focus on the tablet screen is good. I did not buy it to use on my smartphone, though, as it requires a later version of Android than is found on my DroidX. I use the software on an ASUS Transformer 101 with keyboard dock, as it needs a USB connection. The Transformer tablet-only configuration does offer a USB adapter that will allow use of dslrController.
It does not yet offer an intervalometer or bramping. (I have not read closely the change notes for what I downloaded this morning.)