Apple has just announced the new version of mobile OS at WWDC 2011, the iOS 5. uploaded all iOS 5 firmware ipsw files for iPhone 4, iPhone 3GS, iPod touch 4G, iPod touch 3G, iPad 1, iPad 2 and Apple TV 2G.Now you can download and update iOS 5 on your idevices without developer account .

Guide:

STEP 1: Install iTunes 10.5 beta from direct link here. [Mac - Windows 32 bit - Windows 64 bit]

STEP 2: Now you need to download the right firmware file for your iOS device:

Download iOS 5 .IPSW beta 1:

• iPad 1G
• iPad 2 (Wi-Fi, GSM, CDMA)
• iPhone 3GS
• iPhone 4 (GSM, CDMA)
• iPod 3G
• iPod 4G

STEP 3: Now open iTunes that you downloaded above and restore using your firmware.

Thanks Brian Sweet

[UPDATE]:You can download iOS 5 Beta 2 IPSW On iPhone, iPad and iPod touch [Direct Links] Click Here