I recently got my iPhone 4 and while I don’t really test phones and technological toys like I used to when I was younger, I can still say that it is a marvellous piece of engineering and software but the feature that has impressed me the most is one that I have not read about, and that is that I think the camera has been considerably improved and it has an HDR feature, which allows you to take far better photographs indoors or when the light is poor. 
Sometimes it over-compensates and makes a photograph a little bit too bright, but if you set the camera to HDR, it will take two images – one as it captures it and another by dynamic range image – which would usually lighten dark areas and give you more quality than before.

I certainly don’t have any problems with sending SMS’s and things like that, as I did with my previous iPhone, but I really cannot say that I have tried out all the features! I pretty much survive on a few applications such as that of the New York Times, Twitter and Blumberg as well as the occasional weather report.