Xcode下载
现在进入apple的developer网站，默认只提供最新的xcode下载的地址，当前最新的是xcode4.1.1，而且只能装在最新的Lion的操作系统上，还是通过AppStore下载安装的，如果是使用比较老的操作系统，或不习惯使用xcode4，那我们就只能下载以前版本的xcode了，几个以前的xcode的下载版本的地址如下:
xcode3.2.6
https://developer.apple.com/devcenter/download.action?path=/Developer_Tools/xcode_3.2.6_and_ios_sdk_4.3__final/xcode_3.2.6_and_ios_sdk_4.3.dmg
Xcode3.2.5andiOSSDK4.2forSnowLeopard(10.6.4)
http://developer.apple.com/ios/download.action?path=/ios/ios_sdk_4.2__final/xcode_3.2.5_and_ios_sdk_4.2_final.dmg
iPhoneSDK3.1.3withXCode3.1.4forLeopard(10.5.7)
http://developer.apple.com/ios/download.action?path=/iphone/iphone_sdk_3.1.3__final/iphone_sdk_3.1.3_with_xcode_3.1.4__leopard__9m2809a.dmg
iPhoneSDK3.1.3withXCode3.2.1forSnowLeopard(10.6.0)
http://developer.apple.com/ios/download.action?path=/iphone/iphone_sdk_3.1.3__final/iphone_sdk_3.1.3_with_xcode_3.2.1__snow_leopard__10m2003a.dmg
iPhoneSDK3.2FinalwithXcode3.2.2forSnowLeopard(10.6.0)
http://developer.apple.com/ios/download.action?path=/iphone/iphone_sdk_3.2__final/xcode_3.2.2_and_iphone_sdk_3.2_final.dmg
Xcode3.2.3andiPhoneSDK4GMseedforSnowLeopard(10.6.2)
http://developer.apple.com/ios/download.action?path=/iphone/iphone_sdk_4_gm_seed/xcode_3.2.3_and_iphone_sdk_4_gm_seed.dmg
Xcode3.2.3andiPhoneSDK4FinalforSnowLeopard(10.6.2)
http://developer.apple.com/ios/download.action?path=/iphone/iphone_sdk_4__final/xcode_3.2.3_and_iphone_sdk_4__final.dmg
Xcode3.2.3andiOSSDK4.0.1forSnowLeopard(10.6.4)
http://developer.apple.com/ios/download.action?path=/ios/ios_sdk_4.0.1__final/xcode_3.2.3_and_ios_sdk_4.0.1.dmg
Xcode3.2.3andiOSSDK4.0.2forSnowLeopard(10.6.4)
http://developer.apple.com/ios/download.action?path=/ios/ios_sdk_4.0.2__final/xcode_3.2.3_and_ios_sdk_4.0.2.dmg
Xcode3.2.4andiOSSDK4.1forSnowLeopard(10.6.4)
http://developer.apple.com/ios/download.action?path=/ios/ios_sdk_4.1__final/xcode_3.2.4_and_ios_sdk_4.1.dmg
Xcode3.2.5andiOSSDK4.2GMforSnowLeopard(10.6.4)
https://developer.apple.com/ios/download.action?path=/ios/ios_sdk_4.2_gm_seed/xcode_3.2.5_and_ios_sdk_4.2_gm_seed.dmg
另外我下载Apple的其他的较早版本的软件都可以从如下地址下载：
http://connect.apple.com/cgi-bin/WebObjects/MemberSite.woa/wa/downloads