My Tablet does not even have USB ports which can connect a keyboard, mouse, flash drive and other USB devices. It can only connect to my computer to run in disk mode to copy and paste files to and from my Tablet to my PC.
But, it is a cheaper tablet, so I don't really mind since I did not pay much for it, and it has a MicroSD card reader slot which can accept a MicroSD card up to 32GB.
Hopefully my next Tablet will have full size USB port for plugging in a Keyboard, mouse, USB Flash drive, and other USB devices without an adapter.
I think USB and USB devices will be the next big thing for tablets since Tablets have fewer features then a desktop, and laptop, but USB can do a lot of useful things like connect more storage, a printer, speakers, and charge smaller devices like cell phones.