I have Xcode 4 on my Mac. Is it possible to install Xcode 3 in a directory other than / Developer?
Please let me know.
The main answer is yes, since separate directories can be installed for them.
Can I install multiple versions of Xcode?
You must reinstall Xcode4 after installing Xcode3, as it can install slightly older versions of some of the things Xcode4 relies on.