I have a Galaxy Tab, too and there is no USB connector. I'm quite sure of this because I had to buy a $20 add-on that hackishly turns the PDMI port into a USB port and looks freakishly ugly while doing so. PDMI is, of course, an industry standard.

I really wish they had put an actual USB port on the thing, or at least a place to put a micro SD card. But if anyone is copying Apple's whole "we don't believe in strain relief" nonsense, I really do hope they stop that. Damaged cables are not beautiful. They make the device look like junk.