manic

Im not to hip on the lcd/plasma tv's. Heres the question. I see these
usb connectors on the tv. Does this mean if I have dvd movies, video,
pics I can load them on a external usb harddrive and watch them on
my new plasma, or lcd tv? Sound and all? Or is this more for viewing
pictures/stills.
If the answer is yes to video, are there any contraints on the format
of these said videos,,will there be a performance issue running off a
usb drive?
Thanks for your input.....