I actually don't get the bumper thing at all, honestly. I was looking at some display iPhone4s the other day in AT&T, chatting with the folks there about the new iPhone, and their thoughts about the Galaxy S, and so on... and I noticed that several of their iPhone4s already had significant scratching just from being on display...
I was pretty shocked, honestly, that they would release a product with easily scratch-able panels on both sides, and then offer a "bumper" band case as the solution to protect it. Completely insane.
The antenna thing was just an accident... but the ridiculous case design... yeah, they did that one on purpose.... But, of course, the Fanboys think its "pretty".