John Mayer’s follow-up to 2001’s “Room For Squares” will be released this fall — and he says that Apple’s iPod has been instrumental in his writing. “I have the Apple iPod, it’s great. Because I can burn my demos and put them into the iPod and then listen to them as I’m driving, or as am going to a radio station, and just really just have time to sit in it and think about it,” Mayer told Launch. “And it’s really fun. It’s really, really fun.”