Today is the day to move to iOS 4 for all of you with an iPhone 3G, 3GS, and recent versions of the iPod Touch. Over 100 new features are listed for this update, the biggest being multitasking, app folders, and access to iBooks. This release is build 8A293 which is the same that was initially released to developers, so it seems that that build was solid enough to release to the general public. Ready to upgrade? Grab it on iTunes today!