In reply to Oujmik:
depends, many tablets are "cheap" because they don't pay MS for the priviledge of using the FAT file system that is common on consumer device SD cards.
but you can do what you are talking about fairly simply. you get yourself a simple mini/micro USB to full sized USB adapter and then either plug your camera or a card reader into the adapter
on android devices you can use RAWdroid to view and transfer the files to your tablet / phone
video will depend on the format. again on my phone, if i copy my canon / gopro vids to the phone memory they both play just fine in the default video player (my phone is not even "that" new galaxy s2 which is now 2 years old.)
total cost of the addons? can be done for under £10