Today was an important day for iPhone, iPad, and iPod users. In addition to announcing the expected iPhone 4 at WWDC, Apple also unveiled the fourth version of its mobile operating system. Instead of calling the operating system iPhone OS 4, however, Apple decided to rename it to iOS 4. This makes sense, especially since Apple seems to be using the OS for much more than just the iPhone.
The update will be available to all iPhone 3G, 3GS, and iPod touch users on June 21. Best of all, it's free--that's right, even iPod touch users will now get the updated OS for free. Considering the number of people who prefer to use the iPod touch as a PDA instead of buying an iPhone and paying monthly data fees, the new features with iOS4 will be a nice perk. Unfortunately, the first generation of the iPod touch won't get the update.Follow me on Twitter.