iOS 5 Beta is available for download

iOS 5 beta 2 and Xcode 4.2 with iOS 5 SDK beta 2 are now available on the iOS Dev Center. Download these new releases today and start developing your apps to take advantage of iCloud Storage, Newsstand Kit, Core Image, GLKit, Twitter, and new Game Center APIs.

iOS 5 has over 200 new features added to the OS. iOS 5 is compatible with iPhone 3GS, iPhone 4, iPod Touch 3^rd/4^th Generations, iPad, and iPad 2.

Here is a list some of the key features:

All your alerts in one place, Notification Center.
Better messaging using iMessage. Now you can send any number of text, photos, videos, locations, and contacts.
Custom newsstand for your subscriptions of ebooks.
Improved calendar and reminders.
Build to tweet. Better integration with twitter.
Improved and easy access for camera options
And much more ..

Check out iOS developer center for download.