Apple today released an update for Xcode pushing it to version 2.3, which includes Apple's GCC 4 based on version 4.0.1 of the Free Software Foundation's GNU Compiler Collection.,adds support for DWARF Debugging Format, improved support for Nasm (Netwide Assembler) for Intel directly as a separate compiler, improvements to sharing precompiled headers, better linking support, "Clean" improvements, improved support for processing Info.plist files, and Dedicated Network Builds targeted at developers of large projects with dedicated build farms for compilation. The debugger also features better tracking of breakpoints across projects, support for template breakpoints, and new DWARF debugging format and .dSYM files.
The update is around 915MB.
The fix list can be seen here.