Probably already mentioned this, but if you connect an Android to your Sony Alpha, the tablet may pick up the JPEG images directly from your camera.
Just put the camera Settings > USB connection to auto, then connect the alpha (via the USB cable that came with it) to the tablet via a USB to micro USB connector.
You can tell if the camera and tablet are recognizing each other because the the camera will go into USB Mode. If they recognise each other, then go to Android gallery, and the camera will be there as an additional SD card (my A77 appears as '100MSDCF'). Obviously, its not tethered: the alpha will act just like it does with you connect it to a normal computer via USB.
Works on my Android tablet, but not on my HTC desire for some reason, probably O/S version related.
Why would you want to do this? Well its a far better screen than the camera back and you can pinch zoom and slide left-right to move between images, and if you have a fast SD card, its pretty much as fast as reviewing in-camera for display speed.
Cheap no-brand 10 inch retina tablets are just coming out now, and Ive got a Novo9 Spark on order, total cost 186 quid direct from the manufacturor.... hopefully will allow me to review images at near to 300dpi but with a dynamic range better than print. That's some super-chimping
Also lets you use all the usual Android apps and upload to the web or backup your keepers onto the tablet. Less useful for RAW though... I think most of the raw decoders just extract the thumbnails, at least fo rnow.