Apple today announced that iOS 4.2 is available today for download for iPad, iPhone and iPod touch.

iOS 4.2 brings over 100 new features from iOS 4.0, 4.1 and 4.2 to iPad including Multitasking, Folders, Unified Inbox, Game Center, AirPlay and AirPrint.

For electronic musicians, the most anticipated feature is improved MIDI support. While this has not been hyped by Apple, many developers have been discussing expanding MIDI support with the iOS 4.2 release.

If you’ve tried out iOS 4.2, let us know what your experiences are and share the details on the apps and MIDI hardware you are using!

Details on iOS 4.2 below.

Apple iOS 4.2

iPad users can now run their favorite apps and switch between them, while preserving iPad’s battery life.

Users can organize their apps with drag-and-drop simplicity using Folders, and Mail now features a Unified Inbox, fast inbox switching and a threaded message view.

Game Center allows iPad, iPhone and iPod touch users to challenge and play friends or be matched automatically with new opponents, showcase their scores and achievements, and discover new games their friends are playing.

AirPlay is a new feature for streaming music, video and photos wirelessly from iPad, iPhone and iPod touch to Apple TV, transforming Apple TV into a great accessory for iPad, iPhone and iPod touch. iOS users also will be able to use AirPort Express and AirPlay to stream wirelessly to any stereo or powered speakers, or directly to AirPlay-enabled speakers coming to market in the months ahead.

AirPrint is a next-generation Wi-Fi print architecture that dramatically simplifies printing by completely eliminating printer drivers. A selection of AirPrint enabled printers including the HP Photosmart, HP LaserJet Pro and HP Officejet will be the first to support printing direct from iOS devices. iPad, iPhone and iPod touch users can simply tap to print their documents or photos wirelessly to any printer that supports AirPrint.

The Find My iPhone (or iPad or iPod touch) feature is now free to use without a MobileMe? subscription and helps you locate your missing device.* The Find My iPhone app is a free download on the App Store? and lets users easily locate a missing device on a map and have it display a message or play a sound. Users can even remotely lock or wipe data from a lost device to protect privacy.

Other new features that iOS 4.2 brings to the iPad include: the ability to rent TV episodes directly to iPad using the iTunes App with a 30 day viewing window and a 48 hour session window once playback is started; the ability to easily find and highlight specific words and phrases on web pages in Safari; enhanced enterprise support so businesses can take advantage of stronger security features, new device management capabilities and improved enterprise integration; industry-leading accessibility enhancements; and support for 25 additional languages, including Korean, Portuguese and Traditional Chinese.