Samsung blatantly copies Apple in a lot of different ways. No Apple shouldn't have a patent on all rectangular screens, but you're a fool if you think that the Galaxy Tab doesn't look like an iPad. Hell, their phone chargers look exactly like iPhone chargers except for the fact that they're black!!!
But let's get some perspective here. Samsung isn't doing themselves any favors by copying Apple's designs. From afar, a potential tablet owner who doesn't know any better is going to think that Galaxy Tab is an iPad if they're just looking at the front. (Unless they notice the "Samsung" label and the fact that it's running a really crappy OS.) Lots of tablet owners use cases (I think even more so than phone users) so you won't see the logo on the back of the Galaxy Tab either.