honestly, this topic has been covered entirely too many times to count... just do a search and you'll see plenty of topics about it.
Apple isn't going to release a different design at least until next summer, and even then it's highly unlikely they'll go back to the original look, so there's not much point in keeping on about it.
Having said that, I prefer the look of the 3G. It looks much more sleek and modern, as opposed to the aluminum iPhone, which looked too bulky and stubby.