Apple today seeded iOS developers with iOS SDK 4.2 beta 3, iOS 4.2 beta 3, and iTunes 10.1 beta 2 via the iOS Dev Center.
• Xcode and iOS SDK 4.2 beta 3: This is a pre-release version of the iOS SDK, as part of the complete Xcode developer toolset for Mac, iPhone, and iPad.
• iOS 4.2 beta 3: This is a pre-release version of iOS 4.2 for iPad, iPhone, and iPod touch.
• iTunes 10.1 beta 2: This is a pre-release version of iTunes 10.1 beta 2 to support testing of printing from your iOS app.
More info and download links for iOS developers here.