Apple has recently updated Xcode to version 2.2 and also updated WebObjects to version 5.3.1, unfortunately the update is available to registered ADC members only.
Notes for the update are:
"The GCC compiler has been upgraded, introducing support for applications moving to the Mac from other Intel platforms. Multiple changes and enhancements have been made in this release."
In other news it has been rumoured that Mac OS X 10.4.4 has entered development and may be delivered before the years end.