iPhone OS 3.1 is available, but are you not sure about downloading the new OS? Maybe you’d like to know what changes there are for iPhone

3.0 before grabbing iPhone 3.1.

Well the guys over at the iphone blog have put together an iPhone OS 3.1 software step-by-step walkthrough which covers all the changes from iPhone 3.0 to iPhone OS 3.1.

The iPhone OS 3.1 walkthrough shows several things such as the new iTunes 9 features, home screen, bug fixes, MobileMe Find My iPhone Remote Passcode Lock, voice control, calendar, messages, maps, settings, photos, iTunes store, Apps Store, and the iPhone, so for that full walkthrough of iPhone 3.1 just hit up the link.