Apple just set loose the 1.1.1 version of the iPhone software over iTunes. The main feature upgrade is the addition of the iTunes Wi-Fi music store to the device. Other than that there are some minor changes, such as the Calculator icon changed, they added a double-tap of the Home button to link you to the iPod or Favorite Contact sections.
It’s pretty sweet to have iTunes on your phone to allow you to download songs from anywhere, the one problem is that I am never usually in a Wi-Fi hotspot unless I’m in my own house on my own network and in that case, I might as well just get on my computer and download them. That could be because I live and work in such a suburban area that free networks are few and far between.
I didn’t jailbreak my device or add third-party apps to my iPhone, so I had nothing to worry about during the install. For a little while after upgrading, my phone was acting screwy and the receiver wouldn’t get sound, I needed to put it on speaker, or plug in a headset. But after I got home and restored the phone it seemed to be working fine.
All in all, if you have an iPhone that isn’t jailbroken and you don’t have to worry about winding up with a brick, you might as well get it, it is a welcome upgrade.