Apple just released iOS 5 beta 5 to its registered developers. The OS, revealed in WWDC two months ago features iMessage, a BBM style messaging service for iDevice users, Safari reader mode and also OTA upgrades, which allows the user to upgrade their iDevices without the need of any computer.
You can download iOS 5 beta 5 only if you are a registered developer. Being a registered developer, you’ll have acces to dev tools offered by Apple to develop apps on iPhone, iPad and iPod Touch. You can even add many iDevices under the same account, so that all of the devices may get the update. The release i available on torrents as well, but are not recommended as they may contain virus, and may hamper your device.
You can sign up for apple’s developer account for $99 here: http://developer.apple.com/devcenter/ios/index.action