Along with iOS 5 beta 4, Apple also released Xcode 4.2 Developer Preview 4, a new version of the software dedicated to iOS application developers. This version of Xcode works with both Mac OS X Snow Leopard and OS X Lion, so you will have no problems using it regardless of which version of Mac OS X you use. You can download Xcode 4.2 Developer Preview 4 from the portal dedicated to developers of applications for iOS.
