Previous versions of iPhone SDK

iPhone SDK 2.2.1 direct download link
http://developer.apple.com/iphone/download.action?path=/iphone/iphone_sdk_for_iphone_os_2.2.1__9m2621a__final/iphone_sdk_for_iphone_os_2.2.19m2621afinal.dmg

iPhone SDK 2.2 direct download link
http://developer.apple.com/iphone/download.action?path=/iphone/iphone_sdk_for_iphone_os_2.2__9m2621__final/iphone_sdk_for_iphone_os_2.2_9m2621_final.dmg


iPhone SDK 3.0 (Xcode 3.1.3) Leopard direct download link
http://developer.apple.com/iphone/download.action?path=/iphone/iphone_sdk_3.0__final/iphone_sdk_3.0__leopard__9m2736__final.dmg

iPhone SDK 3.0 (Xcode 3.2) Snow Leopard direct download link
http://developer.apple.com/iphone/download.action?path=/iphone/iphone_sdk_3.0__final/iphone_sdk_3.0__snow_leopard__final.dmg


iPhone SDK 3.1 with Xcode 3.1.4 Leopard direct download link
http://developer.apple.com/iphone/download.action?path=/iphone/iphone_sdk_3.1__final/iphone_sdk_3.1_with_xcode_3.1_final__leopard__9m2809.dmg

iPhone SDK 3.1 with XCode 3.2.1 for Snow Leopard
http://developer.apple.com/iphone/download.action?path=/iphone/iphone_sdk_3.1__final/iphone_sdk_3.1_with_xcode_3.2_final__snow_leopard__10a432.dmg

iPhone SDK 3.1.2 with XCode 3.1.4 for Leopard
http://developer.apple.com/iphone/download.action?path=/iphone/iphone_sdk_3.1.2__final/iphone_sdk_3.1.2_with_xcode_3.1.4__leopard__9m2809.dmg

iPhone SDK 3.1.2 with XCode 3.2.1 for Snow Leopard
http://developer.apple.com/iphone/download.action?path=/iphone/iphone_sdk_3.1.2__final/iphone_sdk_3.1.2_with_xcode_3.2.1__snow_leopard__10m2003.dmg

iPhone SDK 3.1.3 with XCode 3.1.4 for Leopard
http://developer.apple.com/iphone/download.action?path=/iphone/iphone_sdk_3.1.3__final/iphone_sdk_3.1.3_with_xcode_3.1.4__leopard__9m2809a.dmg

iPhone SDK 3.1.3 with XCode 3.2.1 for Snow Leopard
http://developer.apple.com/iphone/download.action?path=/iphone/iphone_sdk_3.1.3__final/iphone_sdk_3.1.3_with_xcode_3.2.1__snow_leopard__10m2003a.dmg