Calm down! For a start, you do need the the camera connection kit for this anyway, but since the iPad is such an excellent media consumption device and it only comes with a fairly small internal memory then don't you think that people might want to have access to a bigger hard drive or memory stick filled with films, photos or other files available?
You need to be jailbroken for this to work but it's absolutely possible and it's an excellent tool to expand the capabilities of an iPad. The only problem is that the power output from the iPad isn't very big so it can only power fairly small memory sticks, or external hdd's if they've got a psu of it's own.