There are iPhone 4 reviews, and there are IPHONE 4 REVIEWS. This got to be the most thorough review so far. It’s really, really good and they go through details such as how the display works in direct sunlight, how much signal loss you get by holding it with the ‘death grip’ and other interesting stuff. So even if you have read a bunch of reviews this one is worth spending a few minutes on.
The iPhone 4 review [anandtech.com]