Apple has made version 3.2.2 of their Xcode developer tools available for download.
Xcode 2.3 released
Apple releases Xcode Update 1.1
Apple's Xcode development tools are available through the Mac App Store, but some people have run into some problems when installing from the store, including hangs during installation and data loss.
Knowledge Base: WebObjects and xCode; iPhoto, iPod issues
Xcode 2.4 released: Stability and performance enhancements
Apple Xcode 2.4.1 released: Stability, security fixes
Build native iPhone applications in Leopard with Xcode 3.0
Xcode to be used for iPhone development; iPhone simulator included
Utilities Updates: Xcode; XRay; SoftRAID; SwitchRes; PDF Browser Plugin