Today is the big day, well, the second to biggest day. Apple is launching iOS 4 and you have got to know how to prepare. "Never go into a battle in a bathrobe, unless your playing video games" is what I like to say. First off, you are going to want to upgrade your iTunes to the latest version, iTunes 9.2. iOS 4 will not work with any other versions of iTunes. Make sure sync your iPhone and sync it well. All those contacts, mail, etc. could be long gone if you don't double check. Finally, if your updating, you might want to restore your phone to factory setting, it's always better to go into that battle with clean underwear. That's about all that you'll need to do before the new OS is ready for download. Did I mention you should update your apps?