I haven't used it on a shoot yet, but I do what you're looking to do sometimes. Specifically, when I'm shootin through my microscope.
I'm using a Samsung Galaxy Tab 10.1 32GB (version 1), Canon camera bodies (5DMKII / 7D / 40D) shooting RAW and an app called DSLR Controller.
Setup is simple. The Galaxy Tab has a port that's used for all kinds of stuff. Looks like it might be Samsung proprietary, but I don't know for sure. In any case, the tablet comes with a charger, naturally, and it has a cable that goes from that port to the charger. The end that plugs into the charger though is mini-USB, which fits right into the camera body and tethers the two together. There's also a Samsung port to USB adapter I got really cheap at the time of purchase (at Best Buy) that I can fit any USB cable into, including USB to mini-USB, for the same effect (in case the cable that comes with it isn't long enough for your purpose.
The moment they're tethered together, the app recognizes what's going on, fires up, lifts the mirror in the body, and I get a live view of whatever the camera sees, along with complete control of nearly every camera function, includig focus, by tapping whatever on the screen in the scene I want to focus on, and adjusting aperture if need be.
I can then, from that app, view any image on the card, which is what you're looking to do.